# Math Help - Implicit Differentiation

1. ## Implicit Differentiation

Use implicit differentiation to find an equation of the line tangent to the curve $x^3 + 2xy +y^3 = 13$ at the point (1, 2).

2. $\begin{array}{l}
x^3 + 2xy + y^3 = 13 \\
3x^2 + \left[ {2y + 2xy'} \right] + 3y^2 y' = 0 \\
\end{array}$