because look at the point at (-1,2) and now move down 5 points and 1 to the right so u will reach the point that is on the y axis. so because u moved 5 down so tht is -5 and moves 1 to the right so tht is 1 and we use rise/run to write our slope. so its -5 and now we see where our point is on the y axis so that is -3. so thats our b because b means y intercept
