So we really want to figure out the slope at the point 1, 1, 4, which is right over here. When x is 1, y is 4. So we want to figure out the slope of the tangent line right over there. So let's start doing some implicit differentiation. So we're going to take the derivative of both sides of this relationship or this equation, depending on how you want to view it. And so let's skip down here, past the orange. So the derivative with respect to x of x squared is going to be 2x.