Use Matrices to Solve the System of Equations $\left\{ \begin{array} { r } 6 x + y - z = 21 \\x + 2 y + z = 15 \\5 y - z = 23\end{array} \right.$

question 35

Multiple Choice

Use matrices to solve the system of equations. $\left\{ \begin{array} { r } 6 x + y - z = 21 \\x + 2 y + z = 15 \\5 y - z = 23\end{array} \right.$

• A) \(( 4,6,2 )\)
• B) \(( 3,5,2 )\)
• C) \(( - 3 , - 5 , - 2 )\)
• D) no solution
• E) infinitely many solutions

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