And then finally, the derivative with respect to x of a constant, that's just going to be equal to 0. Now let's see if we can solve for the derivative of y with respect to x. So the most obvious thing to do, let's make it clear. This right over here I can rewrite as 2x minus 2y. So let me do that. So I can save some space. This is 2x minus 2y if I just distribute the 2.