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Solve the System by Using the Inverse of the Coefficient 3xy9z=689x3z=302y+z=23\begin{array} { c } 3 x - y - 9 z = - 68 \\- 9 x - 3 z = - 30 \\2 y + z = 23\end{array}

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Solve the system by using the inverse of the coefficient matrix.
- 3xy9z=689x3z=302y+z=23\begin{array} { c } 3 x - y - 9 z = - 68 \\- 9 x - 3 z = - 30 \\2 y + z = 23\end{array}


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