y is equal to 4x + 4 in the first equation, and equals -3x - 3 in the second. We can equate the two equations as follows:
4x + 4 = -3x - 3
Keeping only x - terms on the left handside, we get
4x + 3x = -3 - 4
Simplifying, we obtain
7x = -7
x = -1
Substituting the value of x in any of the initial two equations should give the same answer for y.
Replacing in the first equation, y is found to be
y = 4(-1) + 4 = 0
Ans: x = -1, y = 0