Gauss-Jordan elimination on $$$\left[\begin{array}{cc|c}5 & -2 & 1\\1 & 3 & 7\end{array}\right]$$$
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Your Input
Perform the Gauss-Jordan elimination on $$$\left[\begin{array}{ccc}5 & -2 & 1\\1 & 3 & 7\end{array}\right]$$$.
Solution
Subtract row $$$1$$$ multiplied by $$$\frac{1}{5}$$$ from row $$$2$$$: $$$R_{2} = R_{2} - \frac{R_{1}}{5}$$$.
$$$\left[\begin{array}{cc|c}5 & -2 & 1\\0 & \frac{17}{5} & \frac{34}{5}\end{array}\right]$$$
Answer
The reduced matrix is $$$\left[\begin{array}{ccc}5 & -2 & 1\\0 & \frac{17}{5} & \frac{34}{5}\end{array}\right] = \left[\begin{array}{ccc}5 & -2 & 1\\0 & 3.4 & 6.8\end{array}\right].$$$A