Aloha :)
$$g_1:\;\left(\begin{array}{c}3\\0\\-1\end{array}\right)+s\left[\left(\begin{array}{c}4\\6\\2\end{array}\right)-\left(\begin{array}{c}3\\0\\-1\end{array}\right)\right]$$
$$g_2:\;\left(\begin{array}{c}3\\0\\-1\end{array}\right)+t\left[\left(\begin{array}{c}3\\0\\-1\end{array}\right)-\left(\begin{array}{c}4\\6\\2\end{array}\right)\right]$$
$$g_3:\;\left(\begin{array}{c}4\\6\\2\end{array}\right)+u\left[\left(\begin{array}{c}4\\6\\2\end{array}\right)-\left(\begin{array}{c}3\\0\\-1\end{array}\right)\right]$$
$$g_4:\;\left(\begin{array}{c}4\\6\\2\end{array}\right)+v\left[\left(\begin{array}{c}3\\0\\-1\end{array}\right)-\left(\begin{array}{c}4\\6\\2\end{array}\right)\right]$$