That's actually what we're trying to solve for. But to use the chain rule, we just have to say it's the derivative of the square root of y with respect to y times the derivative of y with respect to x. This is the derivative of this thing with respect to x. So we get this on the left-hand side, on the right-hand side, we just have a 0. And now once again, we can attempt to solve for the derivative of y with respect to x. And maybe the easiest first step is to subtract the square root of y from both sides of this equation. And actually, let me move all of this stuff over so I have, once again, more room to work with.