![\left[\begin{array}{cccc}1&3&-2&400\\-1&-2&-1&-100\\-1&-1&-3&700\end{array}\right]](/tpl/images/0696/4945/c47cb.png)
![\left[\begin{array}{cccc}1&3&-2&400\\0&1&-3&300\\-1&-1&-3&700\end{array}\right]](/tpl/images/0696/4945/927c7.png)
![\left[\begin{array}{cccc}1&3&-2&400\\0&1&-3&300\\0&2&-5&1100\end{array}\right]](/tpl/images/0696/4945/74956.png)
![\left[\begin{array}{cccc}1&3&-2&400\\0&1&-3&300\\0&0&1&500\end{array}\right]](/tpl/images/0696/4945/460bd.png)
Find the echelon form of this augmented matrix
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Answers: 1
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