Write an equation of the tangent line to the graph of a differentiable function (y as a function of x) which satisfies the relation x^2+4xy+y^2=13 at the point (2,1).

Please show how the answer is obtained.

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x² + 4xy + y² = 13 at the point (2, 1). Differentiating both sides of this equation with respect to x,the first term gives... View the full answer

## This question was asked on Jul 19, 2016 and answered on Jul 19, 2016.

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