Find an equation for the hyperbola whose graph has vertices $(+-4,0)$ and asymptotes $y=+-\frac{1}{5}x.$

The equation has the form $($input $a$ or b$)$

$($a$)\frac{x^2}{a^2}-\frac{y^2}{b^2}=1,$ or $($b$)\frac{y^2}{a^2}-\frac{x^2}{b^2}=1$;

the positive numbers $a=,$ and $b=.$