## Elementary Linear Algebra 7th Edition

Since $ad-bc=3-3= 0$, then $A$ has no inverse.
Let the matrix $A$ be given by $$A=\left[\begin{array}{ccc}{-1} &{1} \\{3}& {-3} \end{array}\right].$$ Since $ad-bc=3-3= 0$, then $A$ has no inverse.