So this right over here is the slope, the slope when x is, at x equals four. So it's the slope of this entire line. And so any other point on this, it's going to be f of four plus the slope times how far you are away from x equals four. So it's going to be times x minus four. Let's just validate that this makes sense. When we put 4.36 here, when we put 4.36 here, actually let me zoom in on this graph just to make things a little bit clearer. So if this is, so I'm going to do a zoom in, I'm going to do a zoom in, I'm going to try to zoom in into this region right over here.