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QUESTION 4 (a) Consider the function f (x, y) = 5xy + 2x -4y . Show that f (2, 2) = 16. Perform a linear

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QUESTION 4 (a) Consider the function f (x, y) = 5xy + 2x -4y . Show that f (2, 2) = 16. Perform a linear approximation to estimate the value of f (1.98, 2.02). How large is the error caused by this approximation? (7 marks) (b) Consider the macroeconomic model (1) Y=C+I+G (2) C= F(Y, T,r) (3) 1 =f ( Y,r) where F and f are continuously differentiable functions with Ff > 0, F; 0, f,

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