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Solve the System by Using the Inverse of the Coefficient −4x−y−9z=−69−5x+7y+5z=36−9x−5y+z=−36\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.
- −4x−y−9z=−69−5x+7y+5z=36−9x−5y+z=−36\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) }\{ ( - 3,3,6 ) \}
B) ∅\varnothing
C) {(3,6,3) }\{ ( 3,6,3 ) \}
D) {(3,3,6) }\{ ( 3,3,6 ) \}

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