APSC248-Assignment 4 (Due 11:59PM, Oct. 25] I 2021 Problem 6 (5 points) In what direction is the derivative of f (x, y) = xy + y; at P(3,2) equal to zero. Problem 7: (5 Points) Is there a direction 0 in which the rate of change of f(x, 1!) = x2 32:}! + 43.13 at P(1.2) equal 14'? Give reasons for your answer. (Ans: not possible) (Bonus, 2 points) If such direction exists, how would you obtain the unit vector for this direction based on given conditions? Just give your thought on how to approach this