(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

[PLAIN]http://img260.imageshack.us/img260/727/picture2mg.png [Broken]

just wondering.. isn't the the matrix on the 1st line already in its reduced row echelon form?

why is another row operation required to obtain the matrix on the 2nd line? (notice the changes to the matrix on the right)

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Reduced row echelon form

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