Use implicit differentiation to find expressions for dy/dx given that (a) xy – y3 + y = 0 (b) y5 – xy2 = 10. If f(x, y) = 3x2 y3 evaluate f(2, 3), f(5, 1) and f(0, 7). If f(x, y) = 2x2 + xy write down...

Use implicit differentiation to find expressions for dy/dx given that (a) xy – y3 + y = 0 (b) y5 – xy2 = 10. If f(x, y) = 3x2 y3 evaluate f(2, 3), f(5, 1) and f(0, 7). If f(x, y) = 2x2 + xy write down an expression for (a) f(a, a) (b) f(b, −b) 3. If f(x, y) = xy2 + 4x