At the point (xo, yo), find the two directions in which the directional derivative D₁f (xn, yo) = −1. Assume that the tangent plane was computed at the point (xo, yo) correspond to the function f (x, y)? A 1.3 1.2 1.1 1 B 1.3 1.2 1.1 == (3, 1). Which of the following contour maps could с 1.3 1.2 1.1 1 0.9 0.9 0.9 0.8 0.8 0.8 0.7 0.7 0.7 2.7 2.8 2.9 3 3.1 3.2 3.3 2.7 2.8 2.9 3 3.1 3.2 3.3 2.7 2.8 2.9 3 3.1 3.2 3.3 x X x О а. В O b. None of the options could represent f О с. С O d. A The linear approximation of a function f (x, y) at a given point (xo, yo) is: z=x-2y-1 The gradient vector Vf (xo, yo) points in the same direction as the vector u = Select one: (1,2). O a. The gradient vector Vf (x0, yo) cannot be determined is we only know the linear approximation. O b. False ○ c. True