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#### karush

##### Well-known member

- Jan 31, 2012

- 3,068

ok did an image due to notation to be correct, we will be talking about this in the zoom class next week

but wanted to some grip of it before. Here is the RREFs

$\text{rref}(B)=\left[ \begin{array}{cccc} 1 & 0 & 7 & 0 \\ 0 & 1 & -3 & 0 \\ 0 & 0 & 0 & 1 \end{array} \right]$

I assume we can switch c3 and c4 to get the triangle

and

$\text{rref}(C)=\left[ \begin{array}{cccc} 1 & 0 & 7 & 0 \\ 0 & 1 & -3 & 0 \\ 0 & 0 & 0 & 1 \end{array} \right]$ |

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