Solving Equations by Simplifying

Tags

CCSS.7.EE.A.1

Simplify the equation but do not solve: (type your answers using NO spaces)

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CCSS.7.EE.B.4A

Solve for y: 

(Type only the number that y is equal to)

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CCSS.6.EE.B.7

• 2

• 1

• 4

• 2

• -2

• 8

• 8

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CCSS.8.EE.C.7B

• x=3

• x=2

• x=-2

• x=1

• x=-10

• x=2

• No Solution

• All Real Numbers

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CCSS.8.EE.C.7A

• m=3

• m=-4

• m=-1

• All real numbers

• 0

• 1

• -1

• 4

Tags

CCSS.8.EE.C.7B

In order to solve the equation 12x = -3(x + 1/3z) for x, a student simplifies the equation as shown: Step 1: 12x = -3x + -2(1/3z) Step 2: 12x = -3x + -z Step 3: 12x – 3x = -z Step 4: 9x = -z Step 5: z = -9x

• The student missed a double negative 12x = -3x – (-z) in step 2.

• The student should have only multiplied x by -3 in step 1.

• The student subtracted 3x when he should have added 3x in step 3.

• The student should have kept the z on the right side in step 5.

Tags

CCSS.HSA.REI.B.3