4x - 4y = -4
- (4x + y = 16)
___________
5y = -20
Now on solving the equation we have:
= 5y = -20
= y = -20/5
= y = -4
If y = -4 then,
= 4x + y = 16
= 4x + (-4) = 16
= 4x = 16 + 4
= x = 20/4
= x = 5
Thus, x = 5, y = -4
