Fungsi Implisit

\begin{equation*}
\begin{split}
& y^3 + 6xy + x^2 = 5 \\\\
& 3y^2 \:.\: y' + 6y + 6xy' + 2x = 0 \\\\
& y'(3y^2 + 6x) = -6y - 2x \\\\
& y' = \frac {-6y - 2x}{3y^2 + 6x}
\end{split}
\end{equation*}