Butir c.
Gunakan Sage untuk mendeskripsikan ruang solusi sistem persamaan linear
\begin{equation*}
\begin{alignedat}{5}
-x_1 \amp \amp \amp \amp \amp {}+{} \amp 2x_4 \amp
{}={} \amp 4 \\
\amp \amp 3x_2 \amp {}+{} \amp x_3 \amp {}+{} \amp 2x_4
\amp {}={} \amp 3 \\
4x_1 \amp {}-{} \amp 3x_2 \amp \amp \amp {}+{} \amp
x_4 \amp {}={} \amp 14 \\
\amp \amp 2x_2 \amp {}+{} \amp 2x_3 \amp {}+{} \amp x_4
\amp {}={} \amp 1 \\
\end{alignedat}
\end{equation*}