Question: A curve has equation 3x - y + xy = 4. The points P and Q lie on the curve. The gradient of the

A curve has equation 3x - y + xy = 4. The

A curve has equation 3x - y + xy = 4. The points P and Q lie on the curve. The gradient of the tangent to the curve is at P and at Q. (a) Use implicit differentiation to show that y-2x = 0 at P and at Q. (b) Find the coordinates of P and Q. (6) (3)

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