Finite Math Examples

$[\begin{array}{c} 1 & 0 & 0 & 0 & \frac{1}{7} \\ 0 & 1 & 0 & 0 & 4 \\ 0 & 0 & 1 & 0 & 5 \\ 0 & 0 & 0 & 1 & - 5 \end{array}]$

Step 1

$[\begin{array}{c} 1 & 0 & 0 & 0 & \frac{1}{7} \\ 0 & 1 & 0 & 0 & 4 \\ 0 & 0 & 1 & 0 & 5 \\ 0 & 0 & 0 & 1 & - 5 \end{array}]$