Word Count : 153

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$$ \begin{bmatrix} 1 & -2 & 1 & | & 0\\[4pt] 2 & 1 & -3 & | & 5\\[4pt] 4 & -7 & 1 & | & -1 \end{bmatrix} $$ Use $R_2\leftarrow R_2-2R_1,\; R_3\leftarrow R_3-4R_1$: $$ \begin{bmatrix} _______ _____ ______ __________ ________ ___.
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