Solve the System by Using the Inverse of the Coefficient $$\begin{array} { l } - 4 x - y - 9 z = - 69 \\- 5 x + 7 y + 5 z = 36 \\- 9 x - 5 y + z = - 36\end{array}$$

question 215

Multiple Choice

Solve the system by using the inverse of the coefficient matrix.
- $$\begin{array} { l } - 4 x - y - 9 z = - 69 \\- 5 x + 7 y + 5 z = 36 \\- 9 x - 5 y + z = - 36\end{array}$$

• A) \(\{ ( - 3,3,6 ) \}\)
• B) \(\varnothing\)
• C) \(\{ ( 3,6,3 ) \}\)
• D) \(\{ ( 3,3,6 ) \}\)

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