27 7 answered Question 3 Suppose that f(x, y) = xy. The directional derivative of f(x, y) in the directional (2, -1) and at the point (2, y) = (3, 1) is Question Help: Video Message instructor Post to forum Submit Question MacBook Pro esc C G Search or type URL @ % & # " > 2 3 4 5 7 Q W m R Y tabScore: 1.57/7 2/7 answered . Question 5 Find the maximum rate of change of the function f(x, y) = - at the point (3,4) Question Help: Video Message instructor D Post to forum Submit Question esc C G Search or type U @ $ % # 2