Consider $x = h(y,z)$ as a parametrized surface $\Phi(y,z)$ in the natural way. Write the equation of the tangent plane to the surface at the point $(-3, 1, -3)$ [with the coefficient of x being 1] given that $\frac{\partial h}{\partial y}(1,-3) = 3$ and $\frac{\partial h}{\partial z}(1,-3) = 5$.
$= 0$.