Solving Systems of Equations by Elimination

What is the first step in solving a system of equations by elimination?

• Graph the equations to find the intersection point.

• Multiply both equations by the same number.

• Add or subtract the equations to eliminate one variable.

• Isolate one variable in one of the equations.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

In the first example, what is the value of y after elimination?

• 12

• -12

• 6

• -6

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

After finding y in the first example, what is the next step?

• Divide both sides by y.

• Add the equations again.

• Multiply both equations by y.

• Substitute y back into one of the original equations.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

In the second example, what is the value of x after solving the system?

• -7

• 7

• -1

• 1

What is the value of y in the third example?

• -10

• -1

• 1

• 10

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

In the fourth example, what is the value of y after elimination?

• 9

• -9

• 1

• -1

Tags

CCSS.8.EE.C.7B

What is the value of x in the fifth example?

• -1

• 2

• -2

• 1

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

In the sixth example, what is the value of y after solving the system?

• -16

• 16

• 8

• -8

Tags

CCSS.7.EE.B.4A

What is the value of x in the seventh example?

• 5

• -5

• 6

• -6

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

In the eighth example, what is the value of y after solving the system?

• 18

• -18

• 9

• -9

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6