x+y-5=0

y=4

x+4-5=0

x=1

1+4-5=0

2]y-5=0

y=0+5

5-5=0

3]2x-y+2=0

y=4

2x-4+2=0

2x=4+2

2x=6

x=3

2×3-4+2=0

6-4+2=0

4]x+3=0

x=0-3

x=-3

-3+3=0

13

1]x-3y+2=0

x=3y-2

2]3x+2y-5=0

3x=-2y+5

3]-x+2y-3=0

-x=-2y+3

4]2x-y+4=0

y=-2x-4