Please help

Part 1 of 3 O Points: 0 of 1 x y2 Consider the paraboloid f(x,y) = 9- 16 4 and the point P( - 12,0) on the level curve f(x,y) =0. Compute the slope of the line tangent to the level curve at P, and verify that the tangent line is orthogonal to the gradient at that point. x2 y z Find the derivative of f(x, y) = 9- 16 4 dy dx S