Solving Systems by Elimination

Solve by elimination
-6x+y= -2
-3x-6y= 12

• (2,0)

• no solution

• (0,-2)

• infinite solutions

Tags

CCSS.8.EE.C.8B

• (-4, -2)

• (2, 5)

• (10, 2)

• (-8, -1)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What does the second equation need to be multiplied by to get the y's to eliminate?

• 5

• 0

• -1

• 2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What does the second equation need multiplied by so that the x's will eliminate?

• 2

• -1

• 4

• 0

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

• (0, -4)

• (2, 4)

• No solution 

• (2, 0)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which variable will eliminate in the system?

• x

• y

• both

• neither

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the system:
x + 6y = 17
x - 3y = 8

• (5, 2)

• (11, 1)

• (1, 11)

• no solution

Tags

CCSS.8.EE.C.8B

What is the next step in solving this system by elimination?
2x + 3y = 9
5x + 3y = 21

• Nothing - it is ready to go.

• Multiply one equation by -1

• Multiply the top equation by 3.

• Multiply the bottom equation by 7.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

4x +  8y = 20
-4x + 2y = -30
Which variable will be eliminated?

• The  x

• The  y

• The  z

• The unknown

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6