Question

find the inverse matrix of
A=[-1 3]
-4 -3

Answer 1

For matrix
\[ \left( \begin{array}{cc} a & b \\ c & d \end{array} \right) \]
inverse is

\[\frac{1}{ad-bc} \left( \begin{array}{cc} d & -b \\ -c & a \end{array} \right)\]