Systems of Equations & Graphing

4x + 8y = 20

-4x + 2y = -30

Which variable will be eliminated?

• x

• y

• x and y

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

4x + 8y = 20

-4x + 2y = -30

Solve the system by elimination, which means to eventually find the common intersection point (x,y)

• (-1, 7)

• (-1, -1)

• (7,-1)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the point of intersection (x,y)?

• (9,2)

• (2, -9)

• (-9,2)

Tags

CCSS.8.EE.C.8B

What is the equation of the graph?

Show it in the form of: y=mx + b

• y = -x + 2

• y = x + 2

• y = 2x + 0

What is the equation of this graph?

• y = -2x + 4

• y = 2x + 4

• y = -x + 4

Solve by elimination:

-x+2y=17

2x+2y=-10

• (4,-9)

• (9,4)

• (-9,4)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the equation of this graph?

• y = 4x +4

• y = -4x + 4

• y= -4x -4

Solve by elimination:

9x-4y=7

x-4y=-17

• (7,5)

• (3,5)

• (5,7)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What are the two equations?

• y = 3x/7 - 3 and y = -4x/7 - 10

• y = 3x/7 + 3 and y = -4x/7 + 10

• y = 3x/7 + 3 and y = 4x/7 - 10

Tags

CCSS.8.EE.C.8B

What is the y intercept in this graph?

• 0

• 1

• -1