Consider the following. f(x, y) = 5x - 4y (a) Evaluate f(9, 1) and f(9.1, 1.05) and calculate Az. f(9, 1) = (No Response) (No Response) Az = (No Response) f(9.1, 1.05) (b) Use the total differential dz to approximate Az. dz = (No Response)

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