What row operations would produce zeroes beneath the first entry in the diagonal? $$\left[\begin{array}{ccc|c} 1 & 1 & -4 & -3 \\ 3 & 0 & 1 & 5 \\ -5 & 3 & 2 & 3 \end{array}\right]$$
Added by Andrea H.
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To do this, we can replace the second row with the result of the second row minus 3 times the first row: $$R_2 \rightarrow R_2 - 3R_1$$ Show more…
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What row operations would produce zeroes beneath the first entry in the diagonal? $$\left[\begin{array}{ccc|c} 1 & 3 & 0 & 2 \\ -2 & 4 & 1 & 1 \\ 3 & -1 & -2 & 9 \end{array}\right]$$
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