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11 HL Planes and Matrices

Use row reduction to express the matrix below in row echelon form (or reduced row echelon form).
$\left[\begin{array}{@{}ccc|c@{}} 1 & 3 & -2 & 4 \\ -2 & -6 & 4 & 9 \\ 2 & 1 & 1 & -2 \end{array}\right]$
Use row reduction to express the matrix below in row echelon form (or reduced row echelon form).
$\left[\begin{array}{@{}ccc|c@{}} 1 & 3 & -2 & 4 \\ -2 & -6 & 4 & 8 \\ 2 & 1 & 1 & -2 \end{array}\right]$