Solve an Equation Review

The first step in solving using the substitution method is __________.

• get x by itself

• get y by itself

• get either variable by itself

• add the equations together

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

 4x + 8y = 20
-4x + 2y = -30

• (-7,1)

• (2,-5)

• (-2,5)

• (7,-1)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the system of Equation (x,y)
–x + 9y = –5
x –5y = 1  

• (-4,-1)

• (4,1)

• (-4,1)

• (1,4)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

How many solutions does this system of equations have?

• One solution

• Infinitely many solutions

• No solutions

• Two solutions

Tags

CCSS.8.EE.C.8B

What does
"solution to a system of equations"
mean?

• It's the point where both equations equal zero

• It's the point where graphs of both equations cross the y-axis

• It's the point that solves both equations at the same time

• It's the point where graphs of both equations cross the x-axis

Tags

CCSS.8.EE.C.8B

What variable do you eliminate?

4x + 8y = 20

−4x + 2y = −30

• X because they have opposite signs

• Y because they have opposite signs

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

2x - 3 + 4x = 27

• 12

• 4

• 5

• 15

Tags

CCSS.8.EE.C.7B

15x + 54 – 39x = -90

• 5

• 8/3

• -2/3

• 6

Tags

CCSS.8.EE.C.7B

Solve  3x - 7 = 32

• 13

• -13

• 12

• -12

Tags

CCSS.7.EE.B.4A