Solve the System $\begin{array} { l } 4 x - 7 y - z = - 17 \\x + 3 y - 5 z = - 9 \\3 x + y + z = 21\end{array}$

question 439

Multiple Choice

Solve the system.
$\begin{array} { l } 4 x - 7 y - z = - 17 \\x + 3 y - 5 z = - 9 \\3 x + y + z = 21\end{array}$

• A) \(\varnothing\)
• B) \(\{ ( 4,5,4 ) \}\)
• C) \(\{ ( - 4,4,8 ) \}\)
• D) \(\{ ( 4,4,5 ) \}\)

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