Use Matrices to Solve the System of Equations (If Possible) $$\left\{ \begin{array} { r l c } - x + y - z & = - 20 \\2 x - y + z & = 29 \\3 x + 2 y + z & = 29\end{array} \right.$$

question 23

Multiple Choice

Use matrices to solve the system of equations (if possible) .Use Gaussian elimination with back-substitution or Gauss-Jordan elimination.​ $$\left\{ \begin{array} { r l c } - x + y - z & = - 20 \\2 x - y + z & = 29 \\3 x + 2 y + z & = 29\end{array} \right.$$ ​

• A)​(-9,-3,8)
• B)​(-9,-3,-8)
• C)(9,-3,8)
• D)​(9,-3,-8)
• E)​(9,3,8)

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