TP 2. Let f(x, y) = x' - y?. (i) Find the level curve of fpassing through the point (5, 3). ( ii) Find the gradient of fat that point. (iii) Make a sketch of both the level curve and the gradient vector. (iv) Determine the equations of the normal line and the tangent line to the curve f(x, y) = x - y at the point (5, 3)