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IM 8 Ch 3.2.1 How Can I Check My Answer
CPM Materials modified by Mr. Deyo
What is your goal?
How can you start?
How can you simplify?
Can you get x alone?
Common Core Standard: 8.EE.7a, 8.EE.7b
IM 8 Ch 3.2.1 How Can I Check My Answer
By the end of the period, I will solve mul‐step equaons and evaluate if the value of the soluon makes the equaon true.
I will demonstrate this by compleng Four‐Square notes and by solving problems in a pair/group acvity.
Learning TargetTitle: IM8 ‐ Ch. 3.2.1 How Can I Check My Answer? Date:
IM 8 Ch 3.2.1 How Can I Check My Answer
Home Work: Sec. 3.2.1Desc. Date Due
Review & Preview
4 Problems: 3‐74, 3‐76, 3‐77, 3‐78
IM 8 Ch 3.2.1 How Can I Check My Answer
IM 8 Ch 3.2.1 How Can I Check My Answer
Vocabulary1) variable
2) expression
3) equation
4) solution
IM 8 Ch 3.2.1 How Can I Check My Answer
IM 8 Ch 3.2.1 How Can I Check My Answer
3.2.1 How Can I Check My Answer?In Section 2.2, you learned to solve equations on an Equation Mat. In this section, you will practice your equationsolving skills while adding a new element: You will check your answer to make sure it is correct.
While solving equations in this lesson, keep these focus questions in mind:
What is your goal?
How can you start?
How can you simplify?
Can you get x alone?
IM 8 Ch 3.2.1 How Can I Check My Answer
370a,b,c
Explanation
• Combine Like Terms• Add/Subtract ___ to Both Sides• Divide Both Sides by ___• Distributive Property
Write the equation. Solve the equation one step at a time. Record your work. Check if your solution is correct.
http://www.cpm.org/technology/general/tiles/?tiledata=a2x__boy__LaabaRb_aabRb8aacmcRabembQavdiaPavbheWavcrdZavcAfeavdZfHaveFeTavd.d7aagJaOavhbbyaahDcFaviXbravjtcGayakai370__
IM 8 Ch 3.2.1 How Can I Check My Answer
In this lesson you have found a solution to an algebraic equation. But what exactly is a solution? Answer each of these questions with your study team, but do not use algebra tiles. Be prepared to justify your answers!
371 WHAT IS A SOLUTION?
a) Preston solved the equation 3x − 2 = 8 and got the solution x = 100. Is he correct? How do you know?
c) With your partner, discuss what you think a solution to an equation is. Write down a description of what you and your partner agree on.
b) Edwin solved the equation 2x + 3 x = 3x 5 and got the solution x = 4. Is he correct? How do you know?
IM 8 Ch 3.2.1 How Can I Check My Answer
372a
Explanation
• Combine Like Terms• Add/Subtract ___ to Both Sides• Divide Both Sides by ___• Distributive Property
Write the equation. Solve the equation one step at a time. Record your work. Check if your solution is correct.
3x + 4 = x + 8
IM 8 Ch 3.2.1 How Can I Check My Answer
372b
Explanation
• Combine Like Terms• Add/Subtract ___ to Both Sides• Divide Both Sides by ___• Distributive Property
Write the equation. Solve the equation one step at a time. Record your work. Check if your solution is correct.
4 − 2y = y + 10
IM 8 Ch 3.2.1 How Can I Check My Answer
372c
Explanation
• Combine Like Terms• Add/Subtract ___ to Both Sides• Divide Both Sides by ___• Distributive Property
Write the equation. Solve the equation one step at a time. Record your work. Check if your solution is correct.
5x + 4 − 2x = −(x + 8)
IM 8 Ch 3.2.1 How Can I Check My Answer
372d
Explanation
• Combine Like Terms• Add/Subtract ___ to Both Sides• Divide Both Sides by ___• Distributive Property
Write the equation. Solve the equation one step at a time. Record your work. Check if your solution is correct.
−2 − 3k − 2 = −2k + 8 − k
IM 8 Ch 3.2.1 How Can I Check My Answer
373 IS THERE ANOTHER WAY?Compare your solution to part (c) of problem 372 with the solution that another pair of students got. Did both solutions involve the same steps? Were the steps used in the same order? If not, copy the other pair’s solution onto your paper. If both pairs used the same steps in the same order to solve the equation, come up with a different way to solve the problem and record it on your paper.
5x + 4 − 2x = −(x + 8)
IM 8 Ch 3.2.1 How Can I Check My Answer
374a
Explanation
• Combine Like Terms• Add/Subtract ___ to Both Sides• Divide Both Sides by ___• Distributive Property
Solve the equation for x one step at a time. Record your work. Check if your solution is correct.
3x + 7 = −x − 1
IM 8 Ch 3.2.1 How Can I Check My Answer
374b
Explanation
• Combine Like Terms• Add/Subtract ___ to Both Sides• Divide Both Sides by ___• Distributive Property
Solve the equation for x one step at a time. Record your work. Check if your solution is correct.
−3x = x − (6 − 2x)
IM 8 Ch 3.2.1 How Can I Check My Answer
374cUse a diagram of the Equation Mat or some other method to explain why −(x − 3) = −x + 3
−(x 3) = −x + 3
IM 8 Ch 3.2.1 How Can I Check My Answer
a)
c)
375 For each equation, a possible solution is given. Check to see if the given solution is correct.
If 3x + 7 = x − 1,
then does x = −4?
b)
d)
http://homework.cpm.org/cpmhomework/homework/category/CC/textbook/CC3/chapter/Ch3/lesson/3.2.1/problem/375
If −2x − 4 = −4x + 3,
then does x = 3?
If −(x − 1) = 4x −5 −3x,
then does x = 3?
If −3x + 5 + 5x − 1 = 0,
then does x = 2?
IM 8 Ch 3.2.1 How Can I Check My Answer
376 For the rule y = −2x + 1, calculate the yvalues that complete the table.
a) Graph your rule on a set of axes. Be sure to create a complete graph. If necessary, see the Math Notes box for this lesson to review what makes a graph complete.
b) Describe your resulting graph. What does your graph look like?
https://www.desmos.com/calculator/hjjyqf11t2http://homework.cpm.org/cpmhomework/homework/category/CC/textbook/CC3/chapter/Ch3/lesson/3.2.1/problem/376
IM 8 Ch 3.2.1 How Can I Check My Answer
a)
c)
377 Simplify each expression.
4x + 7 + 3y − (1 + 3y + 2x)b)
d)
16x2 −4x +5 − (16x2 − 8x) +1
http://homework.cpm.org/cpmhomework/homework/category/CC/textbook/CC3/chapter/Ch3/lesson/3.2.1/problem/377
(32x − 7y) − (28x − 11y) y + 2 + 2y + 2 + 2y − 2x + y
IM 8 Ch 3.2.1 How Can I Check My Answer
BurgersoRama is the best hamburger place in town. The owner, Ms. Hamm, buys two 5pound packages of meat for $27.50. Use proportional reasoning to determine the information below. Be sure to explain your answer and organize your reasoning.
a) What should Ms. Hamm pay for 25 pounds of meat?
378
b) How many pounds can Ms. Hamm buy for $55.00?
http://homework.cpm.org/cpmhomework/homework/category/CC/textbook/CC3/chapter/Ch3/lesson/3.2.1/problem/378