Solve the System Using the Inverse That Is Given for the Coefficient

question 146

Multiple Choice

Solve the system using the inverse that is given for the coefficient matrix.
- $x + 2 y + 3 z = 12$ $x + y + z = - 5$ $2 x + 2 y + z = 1$$\quad$ The inverse of $\left[ \begin{array} { l l l } 1 & 2 & 3 \\ 1 & 1 & 1 \\ 2 & 2 & 1 \end{array} \right]$ is $\left[ \begin{array} { r r r } - 1 & 4 & - 1 \\ 1 & - 5 & 2 \\ 0 & 2 & - 1 \end{array} \right]$

• A) \(\{ ( - 33,39 , - 11 ) \}\)
• B) \(\{ ( - 17,75,1 ) \}\)
• C) \(\{ ( 48,10,1 ) \}\)
• D) \(\{ ( - 7 , - 11 , - 9 ) \}\)

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