Solving Systems by Elimination Practice

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

• x

• y

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

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

• Get both equations in standard form (Ax + By = C) and line up the like terms.

• Get both equations in slope-intercept form (y=mx+b).

• Get both equations equal to zero.
• Put the x terms first.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve using elimination.
-4x - 6y = 6
4x + 6y = -4

Tags

CCSS.8.EE.C.8B

Solve using elimination. 
−4x − 4y = 0
4x + 4y = 0 

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

Solve the system of Equation (x,y)
x + 4y = –3
 x + 7y = –12 

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which variable will be eliminated?

• x

• y

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6