Problem 3: Let f(x, y) =xe+5y. (a) Find the slope of the surface = 2 = f(x, y) in the x-direction at the point (3,0). (b) Find the slope of the surface = f(x, y) in the y-direction at the point (3.0). (c) Repeat (a) and (b) for f(x, y) =