Solve the System by Using the Inverse of the Coefficient $$\begin{array} { l } 2 x + 8 y + 6 z = 20 \\4 x + 2 y - 2 z = - 2 \\3 x - y + z = 11\end{array}$$

question 354

Multiple Choice

Solve the system by using the inverse of the coefficient matrix.
- $$\begin{array} { l } 2 x + 8 y + 6 z = 20 \\4 x + 2 y - 2 z = - 2 \\3 x - y + z = 11\end{array}$$

• A) \(\{ ( - 1,2,1 ) \}\)
• B) \(\varnothing\)
• C) \(\{ ( 2 , - 1,4 ) \}\)
• D) \(\{ ( 2,1,6 ) \}\)

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