Algebra 1SuperchallengeSystems of Equations ShareSystems of Equations · Superchallenge problemSolve {x+2y−z=22x−y+3z=9−x+y+2z=7\begin{cases} x+2y-z=2 \\ 2x-y+3z=9 \\ -x+y+2z=7 \end{cases}⎩⎨⎧x+2y−z=22x−y+3z=9−x+y+2z=7A(−1,2,3)(-1, 2, 3)(−1,2,3)B(1,−2,3)(1, -2, 3)(1,−2,3)C(2,1,3)(2, 1, 3)(2,1,3)D(1,2,3)(1,2,3)(1,2,3)Check Show answer Walk through it step by step Practice more like this Review this concept