Solve Using Elimination $\left\{ \begin{array} { l } x + 3 y + z = 8 \\3 x - 6 y + z = - 8 \\4 x - y - 8 z = - 6\end{array} \right.$

Solve using elimination: $\left\{ \begin{array} { l } x + 3 y + z = 8 \\3 x - 6 y + z = - 8 \\4 x - y - 8 z = - 6\end{array} \right.$