$\text {Solve the system.}$ $\begin{array} { l } - 3 x + 4 y = 9 \\12 x - 16 y = - 36\end{array}$

$\text {Solve the system.}$
$\begin{array} { l } - 3 x + 4 y = 9 \\12 x - 16 y = - 36\end{array}$