Recall that the general equation for a line is y=mx+b where m is the slope and b is the y-intercept. First, let's find the slope by finding (y2-y1)/(x2-x1): (-8-0)/(-5-3) -8/-8 1
Now we know the equation is y=1x+b, or y=x+b. By plugging in one of the two points we know is on the line, we can solve for b. 0=3+b b=-3