Hello hello. In class we went over the ''mini-chain rule'' once, and haven't gone over the real chain rule yet. I really want to understand how to go about solving this equation, and to really understand what is happening here. x=u3-3uv2 y=3u2v-v3 z=u2-v2 Define z as a function of x and y. Determine delZ/delx at the point (u,v) = (2,1) which corresponds to the points (x,y) = (2,11) I can see from the last point that points (u,v) = (x(u,v), y(u,v)) f(x,y) should equal z. I am just confused how to interpret this with z = u2-v2. Since I received this as homework, I am guessing it can be done with partial derivatives. Any insight into this would be welcomed!