Hello,

I am doing my math homework, and I come across two problems I can't tend to do. Something always come up wrong. If anyone can help me, it is truly appreciated. Thank you so much.

I have to find the reduce echelon form for these two problems

$\displaystyle

A=\[ \left( \begin{array}{ccccc}1 & -2 & 1 & 1 & 4\\2 & 1 & -3 & -1 & 6\\1 & -7 & -6 & 2 & 6\end{array} \right)\]

$

$\displaystyle

A=\[ \left( \begin{array}{ccccc}0 & 1 & 2 & 1\\2 & 1 & 0 & 2\\0 & 2 & 1 & 1\end{array} \right)\]

$