Solve the System by Using the Inverse of the Coefficient $$\begin{array} { c } 3 x - y - 9 z = - 68 \\- 9 x - 3 z = - 30 \\2 y + z = 23\end{array}$$

question 36

Multiple Choice

Solve the system by using the inverse of the coefficient matrix.
- $$\begin{array} { c } 3 x - y - 9 z = - 68 \\- 9 x - 3 z = - 30 \\2 y + z = 23\end{array}$$

• A) \(\{ ( 1,7,8 ) \}\)
• B) \(\varnothing\)
• C) \(\{ ( 1,8,7 ) \}\)
• D) \(\{ ( - 1,8,2 ) \}\)

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