Answer:
(x, y) = (3, -1)
Step-by-step explanation:
Multiply the second equation by 2 and subtract the first equation.
... 2(2x +2y) -(4x -3y) = 2(4) -(15)
... 7y = -7 . . . . . . simplify
... y = -1 . . . . . . . .divide by 7
Substitute this value into the second equation.
... 2x +2(-1) = 4
... 2x = 6 . . . . . . . add 2
... x = 3 . . . . . . . . divide by 3
The solution is (x, y) = (3, -1).
