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1 6.6 (A.21a) Inequality Word Problems.notebook 1 January 02, 2014 Dec 85:22 PM WarmUp Graph the following. 6 5 4 3 2 1 0 1 2 3 4 5 6 6 5 4 3 2 1 1 2 3 4 5 6 x y 6 5 4 3 2 1 0 1 2 3 4 5 6 6 5 4 3 2 1 1 2 3 4 5 6 x y Dec 85:22 PM Today's Agenda * WarmUp * Review Inequalities and Graphing Systems * 6.6 Inequality Word Problems * Classwork * Homework Dec 85:22 PM Buzz Words LESS THAN GREATER THAN no more than at least at most < > more than no fewer than Dec 85:22 PM Do You Remember? Solve for y. Solve for y. REMEMBER the TRICK If you MULTIPLY or DIVIDE by a negative number, you MUST SWITCH the inequality sign! Dec 85:22 PM 6.6 Solving Inequality Word Problems Benchmark: A.21a Solve linear inequality word problems by graphing. Goals: Write linear inequalities given a real life situation. Dec 85:22 PM Example #1 Tim wants to take his team out for pizza. A large pizza costs $15 and a pitcher of soda costs $5. Tim wants to spend no more than $45. a. Write an inequality to represent this situation.

1 6.6 (A.21a) Inequality Word Problems.notebook Word... · 2014-01-08 · 1 6.6 (A.21a) Inequality Word Problems.notebook 2 January 02, 2014 Dec 85:22 PM Graphing Linear Inequalities

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Page 1: 1 6.6 (A.21a) Inequality Word Problems.notebook Word... · 2014-01-08 · 1 6.6 (A.21a) Inequality Word Problems.notebook 2 January 02, 2014 Dec 85:22 PM Graphing Linear Inequalities

1   6.6 (A.21a) Inequality Word Problems.notebook

1

January 02, 2014

Dec 8­5:22 PM

Warm­Up

Graph the following.

­6 ­5 ­4 ­3 ­2 ­1 0 1 2 3 4 5 6

­6

­5

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­1

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y

­6 ­5 ­4 ­3 ­2 ­1 0 1 2 3 4 5 6

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Dec 8­5:22 PM

Today's Agenda

* Warm­Up

* Review Inequalities and Graphing Systems

* 6.6 Inequality Word Problems

* Classwork

* Homework

Dec 8­5:22 PM

Buzz Words

LESS THAN GREATER THAN

no more than

at least

at most

<>more than

no fewer than

Dec 8­5:22 PM

Do You Remember?

Solve for y. Solve for y.

REMEMBER the TRICK

If you MULTIPLY or DIVIDE by a negative number, you MUST SWITCH the inequality sign!

Dec 8­5:22 PM

6.6 Solving Inequality Word Problems

Benchmark: A.21a ­ Solve linear inequality word problems by graphing.

Goals:

Write linear inequalities given a real life situation.

Dec 8­5:22 PM

Example #1

Tim wants to take his team out for pizza. A large pizza costs $15 and a pitcher of soda costs $5. Tim wants to spend no more than $45.

a. Write an inequality to represent this situation.

Page 2: 1 6.6 (A.21a) Inequality Word Problems.notebook Word... · 2014-01-08 · 1 6.6 (A.21a) Inequality Word Problems.notebook 2 January 02, 2014 Dec 85:22 PM Graphing Linear Inequalities

1   6.6 (A.21a) Inequality Word Problems.notebook

2

January 02, 2014

Dec 8­5:22 PM

Graphing Linear Inequalities

STEP 1: Write the inequality in slope­intercept form.

Solve for y.

STEP 2: Graph the line.

BEGIN with the y­intercept, b, and MOVE with the slope, m.

Dec 8­5:22 PM

Graphing Linear Inequalities

STEP 3: Determine whether the boundary line is solid or dashed.

DASHED

SOLID

STEP 4: Determine which region should be shaded.

BELOW the boundary line

ABOVE the boundary line

Dec 8­5:22 PM

How to Check Your Graph

AFTER you graph and shade your inequality...

­ Substitute (0 , 0) into your ORIGINAL inequality.

­ If you get a TRUE statement ­ (0 , 0) should be shaded.

­ If you get a FALSE statement ­ (0 , 0) should NOT be shaded.

Dec 8­5:22 PM

Graph the Inequality                        CHECK LIST:

Label the graph

Slope­intercept form

Graph the line

Boundary line ­ Dashed? Solid?

Shading ­ Above? Below?

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Dec 8­5:22 PM

Example #1 (continued)

What is one possible combination of pizza and soda that Tim could afford?

Dec 8­5:22 PM

Example #2

Suppose you have at most $80 to spend at a music and book store. You want to buy books for $8 each and CDs for $10 each. You want to buy some books and some CDs.

a. Write an inequality to represent this situation.

Page 3: 1 6.6 (A.21a) Inequality Word Problems.notebook Word... · 2014-01-08 · 1 6.6 (A.21a) Inequality Word Problems.notebook 2 January 02, 2014 Dec 85:22 PM Graphing Linear Inequalities

1   6.6 (A.21a) Inequality Word Problems.notebook

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January 02, 2014

Dec 8­5:22 PM

b. Graph the inequality.

c. What are 3 possible combinations of books and CDs that you could buy?

0 1 2 3 4 5 6 7 8 9 10

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Dec 8­5:22 PM

Example #3

Tom wants to buy some toy trains and dolls for his kids. A train costs $8 and a doll costs $6, but he doesn't want to spend more than $48.

a. Write an inequality to represent this situation.

Dec 8­5:22 PM

b. Graph the inequality.

c. What does the point (4 , 8) represent in this situation? Is it a possible solution?Explain.

0 1 2 3 4 5 6 7 8 9 10

1

2

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5

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7

8

9

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y

Dec 8­5:22 PM

Example #4

Sue wants to buy shirts and jeans. A shirt costs $25 and jeans cost $50, but she doesn't want to spend more than $250.

a. Write an inequality to represent this situation.

Dec 8­5:22 PM

b. Graph the inequality.

c. What does the point (5 , 2) represent in this situation? Is it a possible solution?Explain.

0 1 2 3 4 5 6 7 8 9 10

1

2

3

4

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6

7

8

9

10

x

y

Dec 8­5:22 PM

Example #5

Sarah is selling bracelets and earrings to make money for summer vacation. The bracelets cost $5 and earrings cost $8. She wants to make at least $40.

a. Write an inequality to represent this situation.

Page 4: 1 6.6 (A.21a) Inequality Word Problems.notebook Word... · 2014-01-08 · 1 6.6 (A.21a) Inequality Word Problems.notebook 2 January 02, 2014 Dec 85:22 PM Graphing Linear Inequalities

1   6.6 (A.21a) Inequality Word Problems.notebook

4

January 02, 2014

Dec 8­5:22 PM

b. Graph the inequality.

c. What does the point (1 , 7) represent in this situation? Is it a possible solution?Explain.

0 1 2 3 4 5 6 7 8 9 10

1

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Dec 8­5:22 PM

Classwork

6.6 Linear Inequality Word Problems

Dec 8­5:22 PM

Classwork

Dec 8­5:22 PM

Classwork

Dec 8­5:22 PM

Classwork

Dec 8­5:22 PM

Classwork

Page 5: 1 6.6 (A.21a) Inequality Word Problems.notebook Word... · 2014-01-08 · 1 6.6 (A.21a) Inequality Word Problems.notebook 2 January 02, 2014 Dec 85:22 PM Graphing Linear Inequalities

1   6.6 (A.21a) Inequality Word Problems.notebook

5

January 02, 2014

Dec 8­5:22 PM

Classwork

7.1 Systems of Equations (Graphing) Review

Dec 8­5:22 PM

I   You a Question

Topic ­ Graphing Linear Inequalities

Please solve the question on your Ticket Out the Door.

On the back of your paper ­ Stoplight Self Assessment

Green ­ I can do this!

Yellow ­ I'm getting there!

Red ­ I need help!

Dec 8­5:22 PM

Almost Finished

Take out your agenda ­ copy down due dates

* Quizzes

* Tests

Homework

***Finish Classwork

Do NOT pack up until you are told to do so!