And then last but not least, what is the derivative of a constant with respect to x? Well, it doesn't change, so it's just going to be equal to zero. All right, now we can solve for our first derivative of y with respect to x. Let's do that. We can add two x to both sides. And we would get two y times the derivative of y with respect to x is equal to two x. And now I can divide both sides by two y.