And the partial derivative with respect to b is going to be flat. So it will be a flat point right over there. The slope of that point in that direction will also be 0, and that is our minimum point. Let's figure out the m and b's that give us this. So if I were to take the partial derivative of this expression with respect to m. So the partial derivative of this expression with respect to m. Well, this first term has no m terms in it, so it's a constant from the point of view of m. And just as a reminder, partial derivatives is just like taking a regular derivative, and you're just assuming that everything but the variable that you're taking the partial derivative with respect to, you're assuming everything else is a constant. So in this expression, all the x's, the y's, the b's, the n's, those are all constant. The only variable when we take the partial derivative with respect to m that matters is the m. So this is a constant, there's no m here.