-5 \\
-2 \\
1
\end{array}\right),\left(\begin{array}{c}
-3 \\
-8 \\
7
\end{array}\right) \text { and }\left(\begin{array}{c}
-1 \\
3 \\
-3
\end{array}\right) \text { are }
Fig: 1
Fig: 2
Fig: 3
Fig: 4