Echelon Matrix/Examples/Arbitrary Example 2

Example of Echelon Matrix

 * $\begin {bmatrix}

1 & 0 & 0 & 3 \\ 0 & 1 & 0 & 2 \\ 0 & 0 & 1 & 1 \\ \end {bmatrix} $ is a reduced echelon matrix.