Answer
$\Rightarrow \left[\begin{array}{cc|c}
1 & -8 & 3\\
0 & 1& -2
\end{array}\right]$.
Work Step by Step
The given matrix is
$\Rightarrow \left[\begin{array}{cc|c}
1 & -8 & 3\\
0 & 7& -14
\end{array}\right]$
Perform $R_2\rightarrow \frac{1}{7} R_2$.
Divide the second row by $7$.
$\Rightarrow \left[\begin{array}{cc|c}
1 & -8 & 3\\
(1/7)0 & (1/7) 7& (1/7)(-14)
\end{array}\right]$
Simplify.
$\Rightarrow \left[\begin{array}{cc|c}
1 & -8 & 3\\
0 & 1& -2
\end{array}\right]$.
