Now we have an equation that has the derivative of y with respect to x in it. And this is what we essentially want to solve for. This is the slope of the tangent line at any point. So all we have to do at this point is solve for the derivative of y with respect to x, solve this equation. So let's do that. And actually, just so we all, so we can do this whole thing on the same page so we can see where we started, let me copy and paste this up here. This is where we left off, and let's continue there.