That's exactly what this is. Well once again, you multiply both sides of this equation by n and you get, you get x1, y1 plus x2, y2 plus all the way, all the way to xn, yn is equal to, is equal to n times the mean of xy's, the mean of the xy's. So n times the mean of the xy's and I think you see where this is going. This term right here, so this term right here is going to be equal to n times the mean of the products of xy. This term right here is n times the mean of the y values. That's what this term right here is. And then this term right here is n times the mean of the x, the mean of the x's squared.