Is this possible?
The row operation that forms the elementary matrix must be of the form of replacing a row by itself added to the multiple of another row, and this can't be done.
2026-04-23 11:05:03.1776942303
Typo in homework question?
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1
It is not a typo.
Use the third row to eliminate the $(2,1)$ entry. $R_2-R_3$ rather than focusing on the first two rows.