Linear Systems Elimination

When you solve the system of equations, what is the solution for y?

• 8

• -1

• 1

• -8

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which variable should we eliminated for first?

4x+8y=20

-4x+2y=-30

• x

• y

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What should the second equation be multiplied by to eliminate the m first?

• 2

• -2

• 3

• -3

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which variable should be eliminated first?

−7x + 6y = 29

10x + y = 16

• x

• y

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which variable should be eliminated first?

4x+8y=20

-4x+2y=-30

• x

• y

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve by elimination:
4x+9y=28
-4x-y=-28

• (-7,0)

• (6,0)

• (-6,0)

• (7,0)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve by elimination:
-9x-4y=-20

5x+4y=4

• (-4,4)

• (4,4)

• (4,-4)

• (-4,-4)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve by elimination:
7x+y=-9

-3x-y=5

• No solution

• (1,8)

• (-2,-3)

• (-1,-2)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the solution to the system?

• (0, 3)

• (1, -1)

• (-3, 1)

• (1, 3)

Tags

CCSS.8.EE.C.8B

Solve by elimination: 
4x + 8y = 20
−4x + 2y = −30

• (-1, 7)

• (-7, 1)

• (7, -1)

• (1, -7)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6