Use Gauss-Jordan Row Reduction to Solve the System of Equations $\begin{array} { l } 7 x - 3 y = - 10 \\- x + 9 y = 70\end{array}$

Use Gauss-Jordan row reduction to solve the system of equations.
​ $\begin{array} { l } 7 x - 3 y = - 10 \\- x + 9 y = 70\end{array}$