Decide Whether or Not the Matrices Are Inverses of Each

Multiple Choice

Decide whether or not the matrices are inverses of each other.
- $$\left[ \begin{array} { l l } - 5 & 1 \\- 7 & 1\end{array} \right] \text { and } \left[ \begin{array} { c c } \frac { 1 } { 2 } & - \frac { 1 } { 2 } \\\frac { 7 } { 2 } & - \frac { 5 } { 2 }\end{array} \right]$$

A) Yes
B) No