So we can say when, let me do it over here. So when, I'll do it right here. When x is equal to negative one and y is equal to one, well, first of all, what's dy dx going to be? The derivative of y with respect to x. Let me scroll down a little bit so we have a little bit more space. The derivative of y with respect to x is going to be equal to one over three times one squared, which is just three, minus negative one. So that's just going to be plus one.