- Thread starter
- #1

#### karush

##### Well-known member

- Jan 31, 2012

- 2,657

complete

$$\left[

\begin{array}{rrrr|r}

1& -6& 4& 0&-1\\

0& 2& -7& 0&4\\

0& 0& 1& 2&-3\\

0& 0& 4& 1&2\

\end{array}\right]$$

ok assume next step is $r_2/2$ and $r_4/4$ introducing fractions

$$\left[

\begin{array}{rrrr|r}

1& -6& 4& 0&-1\\

0& 2& -7& 0&4\\

0& 0& 1& 2&-3\\

0& 0& 4& 1&2\

\end{array}\right]$$

ok assume next step is $r_2/2$ and $r_4/4$ introducing fractions

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