3. (3) Find an expression in terms of x and y for the gradient of the curve x2+kxy+4y2 =48 [3] (b) The diagram shows the
3. (3) Find an expression in terms of x and y for the gradient of the curve x2+kxy+4y2 =48 [3] (b) The diagram shows the curve where k = 2 . 1" Find the values of y for which the tangent to the curve is vertical. [3] (0) Explain what happens to the gradient when k = 4. [1]
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