Answer
$ \displaystyle \left[\begin{array}{ll}
-1.1102 * 10^{-16} & 0 & 1\\
-1/7 & -5/7 & -2/7\\
25/7 & 13/7 & 22/7
\end{array}\right]$
Work Step by Step
The question asks to use a graphing calculator to find $AB^{-1}$
Work is done with the online matrix calculator
desmos.com/matrix
See image below.
A and B are given in the image.