Upload
samantha-turner
View
214
Download
1
Embed Size (px)
Citation preview
Chapter 8Algebra: Ratios and Functions
Click the mouse or press the space bar to continue.
Chapter 8Algebra: Ratios and Functions
Click the mouse or press the space bar to continue.
Lesson 8-1 Ratios and Rates
Lesson 8-2 Problem-Solving Strategy: Look for a Pattern
Lesson 8-3 Ratio Tables
Lesson 8-4 Equivalent Ratios
Lesson 8-5 Problem-Solving Investigation: Choose the Best Strategy
Lesson 8-6 Algebra: Ratios and Equations
Lesson 8-7 Algebra: Sequences and Expressions
Lesson 8-8 Algebra: Equations and Graphs
88Algebra: Ratios and Functions
Five-Minute Check (over Chapter 7)
Main Idea and Vocabulary
California Standards
Example 1
Example 2
Example 3
8-18-1 Ratios and Rates
Ratios and Tangrams
8-18-1 Ratios and Rates
• I will express ratios and rates in fraction form.
• ratio
• rate
• unit rate
8-18-1 Ratios and Rates
Preparation for Standard 6NS1.2 Interpret and
use ratios in different contexts (e.g., batting
averages, miles per hour) to show the relative
sizes of two quantities, using appropriate
notations .
Write the ratio in simplest form that compares the number of scooters to the number of unicycles.
8-18-1 Ratios and Rates
=410
25
unicyclesscooters
8-18-1 Ratios and Rates
Answer: The ratio of unicycles to scooters is ,
2 to 5, or 2:5. This means that for every
2 unicycles there are 5 scooters.
25
8-18-1 Ratios and Rates
Write the ratio in simplest form that compares the number of singers in a duet to the number in an octet.
A. 14
D. 24
C. 18
B. 28
8-18-1 Ratios and Rates
Several students were asked to name their favorite kind of book. Write the ratio that compares the number of people who chose sports books to the total number of responses.
7 students preferred sports out of a total of 7 + 9 + 4 + 5 or 25 responses.
8-18-1 Ratios and Rates
725
sports responsestotal responses
Answer: The ratio in simplest form of the number of
students who chose sports to the total number
of responses is , 7 to 25, or 7:25. So,
seven out of every 25 students preferred
sports.
725
8-18-1 Ratios and Rates
Several students were asked to name their favorite kind of movie. Choose the ratio that compares the number of people who chose thriller movies to the total number of responses in simplest form.
A. 12:18
B. 2:3
C. 2:5
D. 12:30
Find the cost per ounce of a 16-ounce jar of salsa that costs $2.88.
Answer: So, the salsa costs $0.18 per ounce.
8-18-1 Ratios and Rates
$2.8816 ounce
$0.181 ounce
=
8-18-1 Ratios and Rates
A 4 pound package of ground beef costs $3.56. What is the cost per pound?
A. $0.99
B. $0.88
C. $0.98
D. $0.89
Five-Minute Check (over Lesson 8-1)
Main Idea
California Standards
Example 1: Problem-Solving Strategy
8-28-2 Problem-Solving Strategy: Look for a Pattern
8-28-2 Problem-Solving Strategy: Look for a Pattern
• I will solve problems by looking for a pattern.
8-28-2 Problem-Solving Strategy: Look for a Pattern
Standard 5MR1.1 Analyze problems by identifying relationships, distinguishing relevant from irrelevant information, sequencing and prioritizing information, and observing patterns.
Standard 5NS2.1 Add, subtract, multiply, and divide with decimals; … and verify the reasonableness of results.
Emelia is waiting for her friend Casey to arrive. It is 1:15 P.M. now, and Casey said that he would be on the first bus to arrive after 6:00 P.M. Emelia knows that buses arrive every 30 minutes, starting at 1:45 P.M. How much longer will it be before Casey arrives?
8-28-2 Problem-Solving Strategy: Look for a Pattern
Understand
What facts do you know?
• It is now 1:15 P.M.
• The first bus arrives at 1:45 P.M.
• Casey will be on the first bus after 6 P.M.
What do you need to find?
• How much longer will it be before Casey arrives?
8-28-2 Problem-Solving Strategy: Look for a Pattern
Plan
Start with the time the first bus arrives and look for a pattern.
8-28-2 Problem-Solving Strategy: Look for a Pattern
Solve
Answer: So, the first bus to arrive after 6:00 P.M. is the 6:15 P.M. bus. Since it is now 1:15 P.M., Casey will not arrive for another 5 hours.
8-28-2 Problem-Solving Strategy: Look for a Pattern
Check
8-28-2 Problem-Solving Strategy: Look for a Pattern
Look back at the problem. Continue adding 30 minutes to the previous arrival time until you reach 6:15 P.M.
Then add up the 30-minute periods.
Five-Minute Check (over Lesson 8-2)
Main Idea and Vocabulary
California Standards
Example 1
Example 2
Example 3
Example 4
8-38-3 Ratio Tables
8-38-3 Ratio Tables
• I will use ratio tables to represent and solve problems involving equivalent ratios.
• ratio table
• equivalent ratio
• scaling
8-38-3 Ratio Tables
Standard 5MR2.3 Use a variety of methods, such as words, numbers, symbols, charts, graphs, tables, diagrams, and models, to explain mathematical reasoning.
Preparation for Standard 5AF1.5 Solve problems involving linear functions with integer values; write the equation; and graph the resulting ordered pairs of integers on a grid.
A recipe calls for 5 cups of water for each cup of pinto beans. Use the ratio table to find how many cups of water should be used for 4 cups of pinto beans.
8-38-3 Ratio Tables
One Way: Find a pattern and extend it.
For 4 cups of beans, you would need a total of 5 + 5 + 5 + 5 or 20 cups of water.
8-38-3 Ratio Tables
2 3
10 15 20
Another Way: Multiply each quantity by the same number.
Answer: So, for 4 cups of pinto beans, you will need 20 cups of water.
8-38-3 Ratio Tables
20
8-38-3 Ratio Tables
The recipe for rice calls for 3 cups of water for each cup of rice. How many cups of water should be used for 6 cups of rice?
A. 18 cups
B. 9 cups
C. 12 cups
D. 16 cups
There are over 50,000 species of spiders. Use the ratio table below to find how many legs a spider has.
8-38-3 Ratio Tables
Answer: So, a spider has 8 legs.
2
168
8-38-3 Ratio Tables
A marathon runner can run 24 miles in 3 hours. How many miles can he run in 1 hour?
A. 16 miles
B. 8 miles
C. 12 miles
D. 4 miles
Coco used 12 yards of fabric to make 9 blouses. Use the ratio table to find the number of blouses she could make with 24 yards of fabric.
Answer: So, with 24 yards of fabric, Coco could make 18 blouses.
8-38-3 Ratio Tables
18
18
13.5
8-38-3 Ratio Tables
Mrs. Stine can grade 48 papers in 96 minutes. How many can she grade in 24 minutes?
A. 6
B. 12
C. 24
D. 96
It takes a worker 70 minutes to pack 120 cartons of books. The worker has 14 minutes of work left. Use a ratio table to find how many cartons of books the worker can pack in 14 minutes.
Answer: So, a worker can pack 24 cartons in 14 minutes.
8-38-3 Ratio Tables
24
8-38-3 Ratio Tables
It takes Sarah 60 minutes to walk 4 miles. How far will she have walked after 30 minutes?
A. 1 mile
B. 2 miles
C. 3 miles
D. 4 miles
Five-Minute Check (over Lesson 8-3)
Main Idea
California Standards
Example 1
Example 2
Example 3
Example 4
Example 5
8-48-4 Equivalent Ratios
8-48-4 Equivalent Ratios
• I will determine if two quantities are equivalent.
8-48-4 Equivalent Ratios
Preparation for Standard 5AF1.5 Solve problems involving linear functions with integer values; write the equation; and graph the resulting ordered pairs of integers on a grid.
Determine if the pair of rates is equivalent. Explain your reasoning.
8-48-4 Equivalent Ratios
42 people on 7 teams; 64 people on 8 teams
Answer: These rates are not equivalent since they are not the same.
42 people7 teams
= 6 people per team
64 people8 teams
= 8 people per team
8-48-4 Equivalent Ratios
Determine if the pair of rates are equivalent.2 chapters in one day; 18 chapters in 9 days
A. Yes, both are 2:1.
B. Yes, both are 18:9.
C. No.
D. not enough information to solve
8-48-4 Equivalent Ratios
Determine if the pair of rates is equivalent. Explain your reasoning.
20 rolls for $5; 48 rolls for $12
Answer: These are equivalent because the rates are the same.
20 rolls$5
= $4 per roll
48 rolls$12
= $4 per roll
8-48-4 Equivalent Ratios
Determine if the pair of rates is equivalent. $12 for 3 hours; $15 for 5 hours
A. Yes, both are $4 an hour.
B. Yes, both are $5 an hour.
C. No, they are not the same.
D. not enough information
One day Jafar sold 21 pizzas in 3 hours. The next day he sold 35 pizzas in 5 hours. Are these selling rates equivalent? Explain your reasoning.
8-48-4 Equivalent Ratios
Write each rate as a fraction. Then find its unit rate.
Answer: Since the rates have the same unit rate, they are equivalent. So, Jafar’s selling rates are equivalent.
8-48-4 Equivalent Ratios
21 pizzas3 hours
=7 pizzas1 hour
35 pizzas5 hours
=7 pizzas1 hour
8-48-4 Equivalent Ratios
Paella sold 27 magazine subscriptions in 3 hours. The next day she sold 32 magazine subscriptions in 4 hours. What are the selling rates for each day? Are they equivalent?
A. 9, 9; yes
B. 9, 8; no
C. 8, 8; yes
D. 8, 9; no
Determine if the pair of ratios is equivalent. Explain your reasoning.
Answer: Since the fractions are not equivalent the ratios are not equivalent.
8-48-4 Equivalent Ratios
5 laps swam in 8 minutes; 11 laps swam in 16 minutes
Write each ratio as a fraction.
The numerator and denominator do not multiply by the same number. So, they are not equivalent.
5 laps8 minutes
11 laps16 minutes
=?
B. No.
8-48-4 Equivalent Ratios
Determine if the pair of ratios is equivalent.
15 pages read in 30 minutes; 22 pages read in 40 minutes
D. not enough information
A. Yes, they are both . 12
C. Yes, they are both . 23
Determine if the pair of ratios is equivalent. Explain your reasoning.
8-48-4 Equivalent Ratios
8 corrals with 56 horses; 4 corrals with 28 horses
Write each ratio as a fraction.
8 corrals56 horses
1 corral7 horses
=?
Answer: Since the fractions are equivalent, the rates are equivalent.
8-48-4 Equivalent Ratios
4 corrals28 horses
1 corral7 horses
=?
8-48-4 Equivalent Ratios
Determine if the pair of ratios is equivalent.
7 barnyards with 49 cows; 9 barnyards with 63 cows
A. Yes, both are 1 barnyard per 7 cows.
B. Yes, both are 7 barnyards per 1 cow.
C. Yes, both are 1 barnyard per 9 cows.
D. No.
Five-Minute Check (over Lesson 8-4)
Main Idea
California Standards
Example 1: Problem-Solving Investigation
8-58-5 Problem-Solving Investigation: Choose the Best Strategy
8-58-5 Problem-Solving Investigation: Choose the Best Strategy
• I will choose the best strategy to solve a problem.
8-58-5 Problem-Solving Investigation: Choose the Best Strategy
Standard 5MR2.3 Use a variety of methods, such as words, numbers, symbols, charts, graphs, tables, diagrams, and models, to explain mathematical reasoning.
Standard 5SDAP1.1 Know the concepts of mean, median, and mode; compute and compare simple examples to show that they may differ.
JUWAN: I took my dog to the veterinarian’s office. While waiting, I noticed that there were more dogs than cats in the waiting room. The vet said that for about every 5 dogs he sees, he sees 2 cats.
YOUR MISSION: Find about how many dogs the vet will see if 21 total pets come into the office.
8-58-5 Problem-Solving Investigation: Choose the Best Strategy
Understand
What facts do you know?
• You know that the ratio of dogs to cats is about 5:2.
What do you need to find?
• You need to find about how many dogs the vet will see.
8-58-5 Problem-Solving Investigation: Choose the Best Strategy
Plan
Use counters to act out how many dogs the vet will see.
8-58-5 Problem-Solving Investigation: Choose the Best Strategy
Solve
Use red counters to represent the dogs and yellow counters to represent the cats. Since the ratio of dogs to cats is 5:2, place 5 red counters and 2 yellow counters in a group. Make groups of 7 counters until you have 21 counters total.
8-58-5 Problem-Solving Investigation: Choose the Best Strategy
Solve
After three groups there are 21 counters, so you can stop making groups. Find the number of red counters to find how many dogs the vet will see. 5 + 5 + 5 = 15.
8-58-5 Problem-Solving Investigation: Choose the Best Strategy
Answer: So, if the vet sees 21 pets, about 15 of them will be dogs.
Check
8-58-5 Problem-Solving Investigation: Choose the Best Strategy
Find the ratio of red counters to yellow counters. If the ratio is equivalent to the original ratio, 5:2, then the answer is correct.
Five-Minute Check (over Lesson 8-5)
Main Idea
California Standards
Example 1
Example 2
Example 3
8-68-6 Algebra: Ratios and Equations
Example 4
Example 5
Example 6
8-68-6 Algebra: Ratios and Equations
• I will solve equations using equivalent fractions.
8-68-6 Algebra: Ratios and Equations
Standard 5AF1.1 Use information taken from a graph or equation to answer questions about a problem situation.
Standard 5AF1.2 Use a letter to represent an unknown number; write and evaluate simple algebraic expressions in one variable by substitution.
8-68-6 Algebra: Ratios and Equations
Since 4 × 7 = 28, multiply the numerator and denominator by 7.
Solve = .45
28x
45
2835
= 5 × 7 = 35
45
28x
=
Answer: So, x = 35.
8-68-6 Algebra: Ratios and Equations
A. x = 36
B. x = 32
C. x = 40
D. x = 2
Solve = .58
20x
8-68-6 Algebra: Ratios and Equations
Answer: So, b = 4.
Since 5 × 4 = 20, multiply the numerator and denominator by 4.
THINK What number multiplied by 4 equals 16? The answer is 4.
b5
1620
=
45
1620
=
Solve = .b5
1620
8-68-6 Algebra: Ratios and Equations
A. h = 12
B. h = 5
C. h = 6
D. h = 1
Solve = . h6
636
8-68-6 Algebra: Ratios and Equations
Solve = .1938
n22
Since = , then n = 11, which would make the
equation true because is the same as .
1938
12
12
1122
Answer: So, n = 11.
8-68-6 Algebra: Ratios and Equations
Solve = .1845
m5
A. m = 2
B. m = 9
C. m = 3
D. m = 7
8-68-6 Algebra: Ratios and Equations
Solve = .2860
7t
Since 7 × 4 = 28, multiply the numerator and denominator by 4.
THINK What number multiplied by 4 equals 60? The answer is 15.
7t
2860
=
715
2860
=
Answer: So, t = 15.
8-68-6 Algebra: Ratios and Equations
Solve = .6480
4y
A. y = 3
B. y = 6
C. y = 5
D. y = 4
8-68-6 Algebra: Ratios and Equations
Out of the 40 students in a gym class, 12 say soccer is their favorite sport. Based on this result, predict how many of the 4,200 students in the community would rate soccer as their favorite sport.
Write and solve an equation. Let s represent the number of students who can be expected to prefer soccer.
8-68-6 Algebra: Ratios and Equations
Class School
12 s40 4200
prefer soccer
total students
prefer soccer
total students=
The denominators 40 and 4,200 are not easily related by multiplication, so simplify the ratio 12 out of 40. Then solve using equivalent fractions.
8-68-6 Algebra: Ratios and Equations
1240
=s
4200=
310
Since 10 × 420 = 4,200, multiply the numerator and denominator by 420.
Answer: So, about 1,260 out of 4,200 students in the school can be expected to prefer soccer.
8-68-6 Algebra: Ratios and Equations
A. 264 girls
B. 300 girls
C. 260 girls
D. 284 girls
Out of the 30 kids in Mrs. Ankrum’s class, 12 are girls. Based on this result, predict how may of the 660 students in the school are girls.
8-68-6 Algebra: Ratios and Equations
Cedric earned $184 for 8 hours of work. At this rate, how much will he earn for 15 hours of work?
Step 1 Set up the equation. Let a represent the amount of money to be earned.
184 dollars
8 hours=
a dollars
15 hours
8-68-6 Algebra: Ratios and Equations
Step 2 Find the unit rate.
184 dollars
8 hours=
23
1=
$345
15 hours
Answer: So, Cedric will earn $345 for working for 15 hours.
8-68-6 Algebra: Ratios and Equations
A. $174
B. $870
C. $850
D. $445
Julio earned $145 for mowing 5 lawns. At this rate, how much will he earn for 30 lawns?
Five-Minute Check (over Lesson 8-6)
Main Idea and Vocabulary
California Standards
Example 1
Example 2
Example 3
Example 4
8-78-7 Algebra: Sequences and Expressions
8-78-7 Algebra: Sequences and Expressions
• I will extend and describe arithmetic sequences using algebraic expressions.
• sequence
• term
• arithmetic sequence
8-78-7 Algebra: Sequences and Expressions
Standard 5AF1.2 Use a letter to represent an unknown number; write and evaluate simple algebraic expressions in one variable by substitution.
Standard 5AF1.5 Solve problems involving linear functions with integer values; write the equation; and graph the resulting ordered pairs of integers on a grid.
8-78-7 Algebra: Sequences and Expressions
Use the words and symbols to describe the value of each term as a function of its position. Then find the value of the tenth term in the sequence.
Notice that the value of each term is 7 times its position number. So the value of the term in position n is 7n.
8-78-7 Algebra: Sequences and Expressions
Now find the value of the tenth term.
7n = 7 × 10
= 70
Replace n with 10.
Multiply.
Answer: So, the value of the tenth term in the sequence is 70.
8-78-7 Algebra: Sequences and Expressions
Use the words and symbols to describe the value of each term as a function of its position. Then find the value of the fifth term in the sequence.
A. 7 times its position number; 7n, 35
B. 6 times its position number; 6 + n, 11
C. 6 times its position number; 6n, 30
D. 3 times its position number; 3n, 15
8-78-7 Algebra: Sequences and Expressions
Use the words and symbols to describe the value of each term as a function of its position. Then find the value of the tenth term in the sequence.
Notice that the value of each term is 2 more than its position number, so the rule is n + 2.
8-78-7 Algebra: Sequences and Expressions
Now find the value of the tenth term.
n + 2 = 10 + 2
= 12
Replace n with 10.
Add.
Answer: So, the value of the tenth term in the sequence is 12.
8-78-7 Algebra: Sequences and Expressions
Use the words and symbols to describe the value of each term as a function of its position. Then find the value of the tenth term in the sequence.
A. 2 less than its position number; 2 – n, 8
B. 2 less than its position number; n – 2, 8
C. 3 less than its position number; 3 – n, 7
D. 3 less than its position number; n – 3, 7
MEASUREMENT There are 60 seconds in 1 minute. It takes Panya 9 minutes to walk to school. Make a table, and then write an algebraic expression relating the number of seconds to the number of minutes. Find how many seconds it takes Panya to walk to school.
8-78-7 Algebra: Sequences and Expressions
Notice that the number of seconds is 60 times the number of minutes.
8-78-7 Algebra: Sequences and Expressions
Now find the ninth term.
8-78-7 Algebra: Sequences and Expressions
60n = 60 × 9
= 540
Replace n with 9.
Multiply.
Answer: So, it will take Panya 540 seconds to walk to school.
8-78-7 Algebra: Sequences and Expressions
There are 60 minutes in an hour. It takes Mr. Daugherty 5 hours each week to grade all of his fifth graders’ papers. Choose an expression and correct answer that represents the amount of minutes Mr. Daugherty spends grading papers each week.
A. 60h; 300 C. 60 – h; 55
D. 60 = h; 5B. ; 1260h
The table to the right shows the number of plants in a garden, based on the number of rows. Write an expression to find the number of plants in n rows.
8-78-7 Algebra: Sequences and Expressions
8-78-7 Algebra: Sequences and Expressions
Answer: So, 3n + 1 gives the number of flowers in n rows.
The number of plants increases by 3, so the rule contains 3n. If the rule were simply 3n, then the valuefor 1 row would be 3. Notice that adding 1 to the number of rows multiplied by 3 gives the number of plants.
8-78-7 Algebra: Sequences and Expressions
Choose the expression to find the number of cars in each row.
A. n + 7
B. n × 8
C. 3n × 8
D. 6n + 2
Five-Minute Check (over Lesson 8-7)
Main Idea
California Standards
Example 1
Example 2
Example 3
8-88-8 Algebra: Equations and Graphs
Example 4
Example 5
Example 6
8-88-8 Algebra: Equations and Graphs
• I will write an equation to describe a linear situation.
8-88-8 Algebra: Equations and Graphs
Standard 5AF1.1 Use the information taken from a graph or an equation to answer questions about a problem situation.
Standard 5AF1.5 Solve problems involving linear functions with integer values; write the equation; and graph the resulting ordered pairs of integers on a grid.
Write an equation to represent the function displayed in the table.
8-88-8 Algebra: Equations and Graphs
Each output y is equal to 5 times the input x.
8-88-8 Algebra: Equations and Graphs
Answer: So, the equation that represents the function is y = 5x.
8-88-8 Algebra: Equations and Graphs
Choose the equation that represents the function displayed in the table.
A. x = 6y
B. y = 3y + 3
C. y = 6x
D. y = x + 6
Javier sells handmade notebooks. He charges $25 for each book. Make a table to show the relationship between the number of b books sold and the total amount Javier earns t.
The total earned (output) is equal to $25 times the number of books made (input).
8-88-8 Algebra: Equations and Graphs
8-88-8 Algebra: Equations and Graphs
Jean sells dream catchers. She charges $15 for each one. Which table correctly shows the relationship between the number of b dream catchers and the total amount Jean earned?
A.
8-88-8 Algebra: Equations and Graphs
Jean sells dream catchers. She charges $15 for each one. Which table correctly shows the relationship between the number of b dream catchers and the total amount Jean earned?
B.
8-88-8 Algebra: Equations and Graphs
Jean sells dream catchers. She charges $15 for each one. Which table correctly shows the relationship between the number of b dream catchers and the total amount Jean earned?
C.
8-88-8 Algebra: Equations and Graphs
Jean sells dream catchers. She charges $15 for each one. Which table correctly shows the relationship between the number of b dream catchers and the total amount Jean earned?
D.
A.
8-88-8 Algebra: Equations and Graphs
Jean sells dream catchers. She charges $15 for each one. Which table correctly shows the relationship between the number of b dream catchers and the total amount Jean earned?
Write an equation to find the total amount earned t for selling b books.
8-88-8 Algebra: Equations and Graphs
Study the table.
The total earned equals $25 times the number of books Javier sells.
8-88-8 Algebra: Equations and Graphs
Answer: So, the equation is t = 25b.
8-88-8 Algebra: Equations and Graphs
Choose the equation to find the total amount t Jean earned.
A. 15t = b C. t + 15 = b
D. 15 × 5 = bB. = b15t
How much will Javier earn if he sells 7 books using the equation t = 25b?
8-88-8 Algebra: Equations and Graphs
t = 25b Write the equation.
t = 25(7) Replace b with 7.
t = 175 Simplify.
Answer: So, Javier will earn $175.
8-88-8 Algebra: Equations and Graphs
How much will Jean earn if she sells 9 dream catchers? Use the equation t = 15b.
A. $140
B. $135
C. $160
D. $155
The table below shows the amount that a kennel charges for grooming a dog. Write a sentence and an equation to describe the data. Then find the total cost of grooming 11 dogs, 12 dogs, and 13 dogs.
8-88-8 Algebra: Equations and Graphs
The cost of getting a dog groomed is $12 for each dog. The total cost t is $12 times the number of dogs d. Therefore, t = 12d.
8-88-8 Algebra: Equations and Graphs
8-88-8 Algebra: Equations and Graphs
The table below shows the amount that a Girl Scout troop charges for a box of cookies. Choose the correct equation to describe the data. Then find the total cost for 12, 13, and 14 boxes of cookies.
8-88-8 Algebra: Equations and Graphs
A. 3t = c; $30, $40, $50
B. 3c = t; $30, $40, $50
C. c + 3 = t; $36, $39, $42
D. 3c = t; $36, $39, $42
Graph the results from Example 5 on a coordinate plane.
8-88-8 Algebra: Equations and Graphs
Step 1 Make a coordinate place with the d values along the x-axis and the t values along the y-axis.
8-88-8 Algebra: Equations and Graphs
Step 2 Using the (d, t) values from Example 5, plot the coordinate plane.
8-88-8 Algebra: Equations and Graphs
Use the information in the table to make a graph on a separate sheet of paper. Choose the best description of the line that is formed.
A. curved, descending line
B. steep, straight, upward line
C. straight, horizontal line
D. “u” shaped line
88Algebra: Ratios and Functions
Five-Minute Checks
Ratios and Tangrams
88Algebra: Ratios and Functions
Lesson 8-1 (over Chapter 7)
Lesson 8-2 (over Lesson 8-1)
Lesson 8-3 (over Lesson 8-2)
Lesson 8-4 (over Lesson 8-3)
Lesson 8-5 (over Lesson 8-4)
Lesson 8-6 (over Lesson 8-5)
Lesson 8-7 (over Lesson 8-6)
Lesson 8-8 (over Lesson 8-7)
88Algebra: Ratios and Functions
A. 8
B. 7
C. 12
D. 9
(over Chapter 7)
Solve 8p = 56.
88Algebra: Ratios and Functions
A. 10
B. 3
C. 12
D. 15
(over Chapter 7)
Solve 30 = 3f.
88Algebra: Ratios and Functions
A. 5
B. 4
C. 3
D. 6
(over Chapter 7)
Solve –15v = –45.
88Algebra: Ratios and Functions
(over Chapter 7)
A. –7
B. 10
C. 7
D. –10
Solve 7y = –70.
88Algebra: Ratios and Functions
C. 23
(over Lesson 8-1)
Write the ratio as a fraction in simplest form.
16 apples out of 24 pieces of fruit
A. 46
B. 28
D. 86
88Algebra: Ratios and Functions
C. 15
(over Lesson 8-1)
Write the ratio as a fraction in simplest form.
18 dogs out of 90 pets
A. 45
B. 810
D. 910
88Algebra: Ratios and Functions
A. $0.50/1 folder
(over Lesson 8-1)
Write the following as a unit rate.
$5 for 10 folders
B. $0.10/1 folder
C. $5.00/1 folder
D. $2.00/1 folder
88Algebra: Ratios and Functions
D. 15 chairs/1 row
(over Lesson 8-1)
A. 12 chairs/1 row
Write the following as a unit rate.
48 chairs for 3 rows
B. 8 chairs/1 row
C. 16 chairs/1 row
88Algebra: Ratios and Functions
B. multiply by 3; 1,458; 4,374; 13,122
(over Lesson 8-2)
C. multiply by 3; 972, 1,844; 3,688
Solve. Luis saw the numbers below in a science report. Describe the pattern. Then find the next 3 numbers in the pattern.
A. multiply by 3; 1,548; 4,747; 13,122
6, 18, 54, 162, 486, __, __, __
88Algebra: Ratios and Functions
A. $26
B. $32
C. $20
D. $24
(over Lesson 8-3)
Use the ratio table to solve the problem. A dozen roses sell for $18. How much will 16 roses cost?
88Algebra: Ratios and Functions
A. $30
B. $36
C. $12
D. $18
(over Lesson 8-3)
Use the ratio table to solve the problem. How much will 24 roses cost?
88Algebra: Ratios and Functions
A. No
B. Yes
(over Lesson 8-4)
Determine if each pair of ratios or rates are equivalent.
$18 in 3 days; $42 in 6 days
88Algebra: Ratios and Functions
A. No
B. Yes
(over Lesson 8-4)
Determine if each pair of ratios or rates are equivalent.
50 desks in 2 rooms; 75 desks in 3 rooms
88Algebra: Ratios and Functions
A. No
B. Yes
(over Lesson 8-4)
Determine if each pair of ratios or rates are equivalent.
8 fruit drinks for $20; 9 fruit drinks for $24
88Algebra: Ratios and Functions
(over Lesson 8-4)
A. No
B. Yes
Determine if each pair of ratios or rates are equivalent.
12 dogs out of 18 pets; 10 dogs out of 15 pets
88Algebra: Ratios and Functions
A. 35 rings
B. 19 rings
C. 34 rings
D. 21 rings
(over Lesson 8-5)
Solve. Tell what strategy you used. Maria is building chains. She uses 1 ring on the first chain, 6 rings on the second, 11 rings on the third, and 16 rings on the fourth. If she continues the pattern, how many rings will be on the next chain?
88Algebra: Ratios and Functions
A. 15
B. 25
C. 100
D. 30
(over Lesson 8-6)
Solve. = w40
58
88Algebra: Ratios and Functions
A. 18
B. 20
C. 15
D. 25
(over Lesson 8-6)
Solve. = 611
n33
88Algebra: Ratios and Functions
A. 18
B. 22
C. 60
D. 15
(over Lesson 8-6)
Solve. = 300a
503
88Algebra: Ratios and Functions
A. 90
B. 88
C. 15
D. 45
(over Lesson 8-6)
Solve. = 1511
x66
88Algebra: Ratios and Functions
A. 5n + 5; 45
B. 15n + 5; 60
C. 15n + 10; 80
(over Lesson 8-7)
Use words and symbols to describe the value of each term as a function of its position. Then find the value of the ninth term in the sequence.
This slide is intentionally blank.