Solve the System Using the Inverse Matrix $\begin{aligned}x + 2 y + z & = 20 \\x + y + z & = 13 \\4 x + y + z & = 19\end{aligned}$

Short Answer

Solve the system using the inverse matrix.
$\begin{aligned}x + 2 y + z & = 20 \\x + y + z & = 13 \\4 x + y + z & = 19\end{aligned}$ $x=\frac{\text { }}{\text { }}$ $y=\frac{\text { }}{\text { }}$ $z=\frac{\text { }}{\text { }}$