Solve these for y

Not sure if these are correct

original:

$\displaystyle \sqrt{[\frac{m(y+n)}{y}]}=p

$

my finished solution

$\displaystyle \frac{mn}{p^2-m}=y$

Next one (I hope the admins won't mind, they're very similar)

original:

$\displaystyle n-y=\frac{4y-n}{m}$

my finished solution

$\displaystyle \frac{n(m+1)}{(4+m)}=y$

Are these correct?