The Matrix Is in Reduced Echelon Form

question 227

True/False

The matrix is in reduced echelon form. $$\left. \left[ \begin{array} { c c c c } 1 & 0 & 0 & 4 \\0 & 1 & 0 & - 8 \\0 & 0 & 1 & 9 \\0 & 0 & 0 & 0\end{array} \right] \quad \begin{array} { c } 7 \\10 \\1 \\0\end{array} \right]$$

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