\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Which of the following describes the set of solutions for the system of equations:$$\left\{\begin{array}{rcrcrcr} x &+& 2y &-& z &=& 1 \\ 2x &+& 3y &+& z &=& 8\end{array}\right.$$