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

question 40

Multiple Choice

Solve the system of equations by using the inverse of the coefficient matrix.
- $$\begin{array}{l}9 x-2 y+5 z=78 \\2 x+3 y-9 z=-50 \\3 x-8 y+6 z=49\end{array}$$

• A) \( (6,-1,7) \)
• B) \( (1,7,1) \)
• C) \( (5,-1,-7) \)
• D) \( (5,1,7) \)

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