Question 320361
(0, 0) and (–5, –4). 
Y=mX+b
m=slope & b=Y intercept.
m=(Y2-Y1)/(x2-x1)
m=(-4-0)/(-5-0)=-4/-5=.8 ans. for the slope.
-4=.8*-5+b
-4=-4+b
b=4-4
b=0 ans. for the Y intercept.
Y=.8X 
{{{ graph( 300, 200, -6, 5, -10, 10, y = .8x) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = .8x).