Non-Unity Variant of Echelon Matrix/Examples/Arbitrary Matrix 3

Examples of Non-Unity Echelon Matrices

 * $\begin {bmatrix}

1 & 1 & 1 & 1 \\ 0 & 2 & 2 & 2 \\ 0 & 0 & 3 & 4 \\ \end {bmatrix} $ is a non-unity echelon matrix.