$\left\{ \begin{aligned}
4 x + 2 z + w & = - 18 \
- x + y + 2 z - w & = 4 \
4 x - y + 2 w & = - 21 \
y + 4 z - w & = - 3
\end{aligned} \right.$

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The Answer of $\left\{ \begin{aligned}
4 x + 2 z + w & = - 18 \
- x + y + 2 z - w & = 4 \
4 x - y + 2 w & = - 21 \
y + 4 z - w & = - 3
\end{aligned} \right.$

$\left\{ \begin{aligned}4 x + 2 z + w & = - 18 \\- x + y + 2 z - w & = 4 \\4 x - y + 2 w & = - 21 \\y + 4 z - w & = - 3\end{aligned} \right.$

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{4x+2z+w=−18−x+y+2z−w=44x−y+2w=−21y+4z−w=−3\left\{ \begin{aligned}4 x + 2 z + w & = - 18 \\- x + y + 2 z - w & = 4 \\4 x - y + 2 w & = - 21 \\y + 4 z - w & = - 3\end{aligned} \right.⎩⎨⎧​4x+2z+w−x+y+2z−w4x−y+2wy+4z−w​=−18=4=−21=−3​

Multiple Choice

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$\left\{ \begin{aligned}4 x + 2 z + w & = - 18 \\- x + y + 2 z - w & = 4 \\4 x - y + 2 w & = - 21 \\y + 4 z - w & = - 3\end{aligned} \right.$

Correct Answer:
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