Substitution

A

100

x=4 

x + 2 

6

200

x=10

2x + 5 

25

300

x=7

6x - 10

32

400

x=15

10x - 25 

125

500

x=11

3x + 8x + 5 

126

B

100

x=20

x - 10 

10

200

x= 6

2x -  12

0

300

x=13

5x + 10 

75

400

x=50

2x - 72

28

500

x=12

4x + 5x - 11

97

C

100

x=2

x + 32

34

200

x=10

3x - 12 

18

300

x=14

7x - 22 

76

400

x= 20

3x - 17

43

500

x=19

5x - 2x + 27 

84

Substituting equations 1

100

Substitute and simplify. Do not solve for x.

y=2x

x+y=10

3x=10

200

Substitute and simplify. Do not solve for x.

y=2x+1

3x+y=15

5x+1=15

300

Substitute and simplify. Do not solve for x.

y=2x+10

3x+2y=20

4x+20=20

400

Substitute and simplify. Do not solve for x.

y=x+7

2x+4y=15

6x+28=15

500

Substitute and simplify. Do not solve for x.

y=3x+7

x+2y=11

7x+14=11

Substituting equations 2

100

Substitute and simplify. Do not solve for x.

y=3

x+2y=10

x+2(3)=10

x+6=10

200

Substitute and simplify. Do not solve for x.

y=2x + 3

y=4x + 7

2x + 3 = 4x + 7

300

Substitute and simplify. Do not solve for x.

y=7x+8

x=4

y=7(4)+8

y = 28 + 8

y = 36

400

Substitute and simplify. Do not solve for x.

y=3x + 8

2x + 3y =20

2x + 3(3x+8) = 20

2x + 9x + 24 = 20

11x +24 = 20

500

Substitute and simplify. Do not solve for x.

x = 10 + y

x = 5y + 2

10 + y = 5y + 2