How do I row-reduce this augmented matrix?
$$ \left[\begin{array}{rrr|r} 1 & 2 & -1 & -3 \\ 3 & 5 & k & -4 \\ 9 & k+13 & 6 & 9 \end{array}\right] $$
2026-04-05 18:36:21.1775414181
stuck on a echelon form row reduction question
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