But all we really care about is the equation for this green line. And there's a couple of ways that you could do this. You could say, well look, a line is generally, there's a bunch of different ways where you can define the equation for a line. You could say a line has a form y is equal to mx plus b where m is the slope and b is the y intercept. Well we already know what the slope of this line is. It is negative two. So we could say y is equal to negative two, negative two times x, times x plus b.