Solve for both systems: 2x - 2y = 4 and 2x - y = 9

2x - 2y = 4

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

2x= 4 +2y

2x/2= 4 +2y/2

x=2+y

2x - y = 9

2(2+y) - y = 9

2(2) (2)(+y) - y = 9

4+2y-y=9

4+y=9

4+y-4=9-4

y=5

x=2+y

x=2+5=7