This is the slope of the line. And this is the y-intercept. This is actually the point 0b right here. What I want to do is I want to find, and that's what the topic of the next few videos are going to be, I want to find an m and a b. So I want to find these two things that define this line so that it minimizes the squared error. So let me define what the error even is. So for each of these points, the error between it and the line is the vertical distance.