Question

Y = x + 4

Answer 1

Substitute y 
−2x − 2= x + 4
-2x-x=4+2
-3x=6
x=6/(-3)=-2
Y = x + 4, y=-2+4=2
(-2,2)

Answer 2

X = -2
y = 2

You can get this by setting the two different y's equal to each other and solving for the x value.