8. Given $y=y_{1}+y_{2}, y_{1}$ is directly proportional to $x$, $y_{2}$ is inversely proportional to $x^{2}$, and when $x=2$ and $x=3$, the value of $y$ is 19. Find the functional relationship between $y$ and $x$.
$y=5 x+\frac{36}{x^{2}}$