Quiz Elimination Review

What would be the first step in finding the solution using elimination?

2x + 2y = -2

3x - 2y = 12

• you cannot solve this using eliminiation

• cross out the 2x and 3x

• cross out the 2y and -2y

• change to slope intercept form and graph

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What would be the first step in finding the solution with elimination?

4x + 3y = 1

x - 3y = -11

• cross out the 3y and -3y

• cross out the 4x and x

• change all the signs of the second equation

• add 1 and -11

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

How do we begin solving this system of equations using the elimination method. Use your notes if necessary.

• Subtract the two equations

• Multiply one equation by -1 and then add the equations

• Multiply the first equation by the second x (or y) coefficient, multiply the second equation by the first x (or y) coefficient, then subtract the equations

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What variable do you eliminate?

4x + 8y = 20

−4x + 2y = −30

• X because they have opposite signs

• Y because they have opposite signs

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

what does the top equation need to be multiplied by to create a zero pair?

2x - 6y = 20

2x + 5y = -11

• -1

• 1

• -2

• 2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

3 x 7

• 12

• 24

• 15

• 21

Tags

CCSS.3.OA.C.7

9 x 9

• 81

• 72

• 64

• 49

Tags

CCSS.3.OA.C.7

10 x 7

• 49

• 60

• 70

• 77

Tags

CCSS.3.OA.C.7

4 x 8

• 24

• 32

• 40

• 28

Tags

CCSS.3.OA.C.7

7 x 7

• 63

• 49

• 42

• 64

Tags

CCSS.3.OA.C.7