Question 748492
y=x -------(A)
y=-3x-8 -------(B)

(A)-(B)

y-y = x-(-3x-8)
0 = x+3x+8
0 = 4x+8
dividing both side by 4
0 = x+2
so x = -2

substituting this into equation (A)
which is y=x
y=-2