Question13. [-/1 Points] DETAILS MY NOTES LARPCALC11 8.1.056.MI.
Write a system of linear equations represented by the augmented matrix. (Use $x, y$, and $z$ as you order as they appear in the augmented matrix. Do not perform any row operations.) $$\left[\begin{array}{rrr:r} 1 & 2 & -2 & -1 \\ 0 & 1 & 1 & 11 \\ 0 & 0 & 1 & -3 \end{array}\right]$$ $\square$ $\square$
Use back-substitution to solve the system. $$(x, y, z)=(\square)$$ $\square$