Solving Systems of Equations by Substitution

Substitution A

100

y = x + 3

y = 11

(8, 11)

200

y=3x+4

x=3

(3,13)

300

Find x.

y = 7x − 5

y = 9x − 9

x = 2

400

7x - 3y = 10

y = 5x - 14

(4, 6)

500

6x + 2y = 28

2x + y = 11

(3, 5)

Substitution B

100

y=6x-4

y=2

(1,2)

200

y = -3x -4

x = y + 4

(0, -4)

300

Find x:

y = 8x − 4

y = 10x − 6

x = 1

400

-2x-3y=20

y=4X+12

(-4, -4)

500

-4x + 7y = -3

x + 5y = 21

(6, 3)

Substitution C

100

y=-3x-9

x=7

(7,-30)

200

y=-2x+6

y=8

(-1,8)

300

Find x.

y = –6x − 7

y = 2x + 9

x = -2

400

-X-3Y=19

Y=-7X+7

(2, -7)

500

-8x - 5y = 10

x - 2y = 4

(0, -2)

Substitution D

100

y=17x-19

x=1

(1, -2)

200

y=-4x+5

x=2

(2,-3)

300

Find x: 

y = 2x − 10

y = –x − 1

x = 3

400

4X-4Y=12

Y=3X+5

(-4, -7)

500

3x + 6y = -12

x - 5y = 24

(4, -4)