QuestionDetermine if $(4,-9,4)$ is a solution of the system. $$\begin{aligned} x+y+z & =-1 \\ x-2 y-z & =18 \\ 2 x-y-2 z & =9 \end{aligned}$$
Choose the correct answer below. The ordered triple is a solution to the system. The ordered triple is not a solution to the system.