Answer:
I don't know if you mean [3,-1] & [-5,3] or [tex]\left[\begin{array}{ccc}3&-1\\-5&3\end{array}\right][/tex]
The inverse for first ones are "none" because they're not square matrices.
However the inverse for [tex]\left[\begin{array}{ccc}3&-1\\-5&3\end{array}\right][/tex] is [tex]\left[\begin{array}{ccc}0.75&0.25\\1.25&0.75\end{array}\right][/tex].
Hope this helps.
