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Solve the System x+y+z=−4x−y+4z=212x+y+z=−8\begin{array} { c } x + y + z = - 4 \\x - y + 4 z = 21 \\2 x + y + z = - 8\end{array}

Question 109

Multiple Choice

Solve the system.
- x+y+z=−4x−y+4z=212x+y+z=−8\begin{array} { c } x + y + z = - 4 \\x - y + 4 z = 21 \\2 x + y + z = - 8\end{array}


A) {(5,−4,−5) }\{ ( 5 , - 4 , - 5 ) \}
B) {(5,−5,−4) }\{ ( 5 , - 5 , - 4 ) \}
C) {(−4,−5,5) }\{ ( - 4 , - 5,5 ) \}
D) ∅\varnothing

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