Let the point be $P_0 = (x_0, y_0, z_0)$ and the parallel vector be $\vec{v} = \langle a, b, c \rangle$.
The vector equation of the line is given by:
$\vec{r}(t) = \vec{r}_0 + t\vec{v}$
where $\vec{r}_0$ is the position vector of the point $P_0$.
The parametric
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