2x + 3y = 0
x + 2y = -1
Notice that if we multiply the second equation by -2 all the way through, we get
-2x - 4y = 2
So we have
2x + 3y = 0
-2x - 4y = 2 add these and we get
-1y = 2 divide both sides by -1
y = -2 and using x + 2y = -1 we have that
x + 2(-2) = -1
x - 4 = -1 add 4 to both sides
x = 3
So (x , y) = (3, -2)
