Substitution and Elimination

Solve the system using substitution

y=8x+1

y=6x+3

• (1, 9)

• (4, 14)

• (0, 1)

• (2, 4)

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

What is the solution?

• (1, -1)

• (-1, 1)

• (0, -2)

• (2, 0)

Tags

CCSS.8.EE.C.8B

Find x and y using the elimination method
2x+3y=7
2x+7y=11

• x=-2, y=-1

• x=2, y=-1

• x=2, y=1

• x=-2, y=1

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

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

• you cannot solve this using elimination

• cross out the 2x and 3x

• Add the like terms. The y terms will cancel out.

• change to slope intercept form and graph

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the system using substitution:

y = -1x - 5

4x - 8y = 4

• (-3, -2)

• (5, -7)

• (3, 9)

• (-5, 4)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Systems by Substitution

5) x = ___

• 22

• 5

• 9

• 4

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which choice shows substitution correctly?

• 2x + 4(3y - 7) = 9

• 2(3y -7) + 4y = 9

Solve the system of equations.
y = 4x + 1
3x + 2y = 13

• (1, 5)

• (5, 1)

• (0.25, 2)

• ∅

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

A ________________ are two or more equations that have the same variables and work together.

• graphing lines

• elimination method

• system of equations

• table

• slope intercept form

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6