13. The hyperbola that has the same asymptotes as $\frac{x^{2}}{9}-\frac{y^{2}}{16}=1$ and passes through the point $(-3,2 \sqrt{3})$ is $\qquad$
13. Let $\frac{x^{2}}{9}-\frac{y^{2}}{16}=\lambda$, substituting $(-3,2 \sqrt{3})$ yields $\lambda=\frac{1}{4}$, thus we get.