Solve the System of Equations by Using the Inverse of the Coefficient

question 104

Multiple Choice

Solve the system of equations by using the inverse of the coefficient matrix.
- $\begin{array}{l}4 x+8 y-z=45 \\x+5 y+7 z=99 \\-7 x+y+z=-19\end{array}$

• A) \( (5,9,7) \)
• B) \( (6,7,7) \)
• C) \( (5,-9,-7) \)
• D) \( (9,7,9) \)

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