Substitution Method

1

100

2x+y=11 7x=14

x=2 y=7

200

-3x+2y=-5 3x=21

x=7 y=8

300

y=2x+4 -5x-5y=-5

x=-1 y=2

400

3x+2y=-15 2x=-18

x=-9 y=-7

500

x-5y=21 -6=24

x=-14 y=-5

2

100

5x-7y=-2 x-4y=-3

x=1 y=1

200

x-y=-2 -2x+2y=2

No solution

300

BONUS:8x+4y=-20 6x+6y=-18

x=-2 y=-1

400

Bonus:-2x-4y=-16 6x-2y=20

x=4 y=2

500

6x-2y=-12 x-6y=-19

x=-1 y=3

3

100

y=5x-7 -3x-2y=12

x=2 y=3

200

2x-3y=-1 y=x-1

x=4 y=3

300

y=-2 4x-3y=18

y=-2 x=3

400

y=6x-11 -2x-3y=7

x=2 y=1

500

BONUS:-3x+3y=4 x+y=3

NO SOLUTION

4

100

BONUS:2x+y=7 -2x-y=6

No solution

200

-5x+y=-2 -3x+6y=-12

x=0 y=-2

300

6x+6y=-6 5x+y=-13

x=-3 y=2

400

-3x+3y=3 -5x+y=13

x=-3 y=-2

500

x+3y=1 -3x-3y=-15

x=7 y=-2

5

100

y=-3x+5 5x-4y=-3

x=1 y=2

200

-3x-3y=3 y=-5x-17

x=-4 y=3

300

-3x-8y=20 -5x+y=19

x=-4 y=-1

400

-7x-2y=-13 x-2y=11

x=3 y=-4

500

-4x+y=6 -5x-y=21

x=-3 y=-6