Solve for both systems - x - y = - 9 and x - 2y = 3

x - 2y = 3

x - 2y+2y = 3+2y

x= 3+2y

- x - y = - 9

- (3+2y) - y = - 9

-3-2y-y=-9

-3-3y=-9

-3-3y+3=-9+3

-3y=-6

-3y/-3=-6/-3

y=2

x= 3+2y

x= 3+2(2)

x= 3+4=7