Test 1/24/23

You need to solve for what before you can substitute?

• A variable

• An answer

• A clue

• A number

To use elimination you need to do what to one of the variables?

• Cancel out

• Solve

• Change

• Switch

Solve by using elimination:

x + 3y = 10

x - 2y = 5

• (7,1)

• (1,7)

• (-1,7)

• (-7,1)

Solve by using elimination:

5x + y = 12

3x + y = 8

• (2,2)

• (-2,-2)

• (-2,2)

• (2,-2)

Solve by using elimination:

2x + y = 3

x + y = 2

• (1,1)

• (-1,-1)

• (-1,1)

• (1,-1)

Solve by using elimination:

x + y = 4

-x + 3y = 16

• (-1,5)

• (-1,-5)

• (1,-5)

• (1,5)

Solve by using substitution:

y = 4

3x + 2y = 17

• (3,4)

• (-3,4)

• (6,4)

• (-6,4)

Solve by using substitution:

y = 4 + x

2x + 2y = 16

• (2,6)

• (-2,6)

• (6,2)

• (-6,2)

Solve by using substitution:

x = 2y - 3

3x - 2y = 7

• (5,4)

• (-5,4)

• (4,5)

• (-4,5)

Solve by using substitution:

5y - 10 = x

3x - 10y = 0

• (20,6)

• (-20,6)

• (6,20)

• (-6,20)