16.00 10.00 2. Suppose z = f (x, y) is given by the plot below. Determine if each of the following is positive, negative, or zero and explain your answer with a sentence or two. (a) fy(-1,1) -4.00, 2 (b) f-(-1,–1) 1 0- 2.00 4.00 -1 -6.00 -8.00. 14.00. -2 (c) fy(1,–1) .00 -12.00 -16.00 1 -1 -2

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