Find the Inverse of the Invertible Matrix $$\left[ \begin{array} { r r } 1 & 4 \\1 & - 5\end{array} \right]$$

Multiple Choice

Find the inverse of the invertible matrix.
- $$\left[ \begin{array} { r r } 1 & 4 \\1 & - 5\end{array} \right]$$

A) $\left[ \begin{array} { c c } \frac { 1 } { 9 } & \frac { 4 } { 9 } \\ \frac { 1 } { 9 } & - \frac { 5 } { 9 } \end{array} \right]$
B) $\left[ \begin{array} { c c } \frac { 5 } { 9 } & \frac { 4 } { 9 } \\ \frac { 1 } { 9 } & - \frac { 1 } { 9 } \end{array} \right]$
C) $\left[ \begin{array} { r r } - \frac { 5 } { 9 } & - \frac { 4 } { 9 } \\ - \frac { 1 } { 9 } & \frac { 1 } { 9 } \end{array} \right]$
D) $\left[ \begin{array} { c c } \frac { 5 } { 9 } & - \frac { 4 } { 9 } \\ \frac { 1 } { 9 } & \frac { 1 } { 9 } \end{array} \right]$