Question 160115
y = 1/2x (-8,-4)
-4=1/2*-8+b
-4=-4+b
b=-4+4
b=0 or (0,0) is the y intercept of this line.
y=x/2+0
{{{ graph( 300, 200, -10, 5, -10, 10, x/2 +0) }}} (graph 300x200 pixels, x from -10 to 5, y from -10 to 10, x/2 +0).