Answer
$${\bf{r}}(t)= \langle 4+t,0,8+t \rangle.$$
Work Step by Step
A vector parametrization for the given line is given by
$${\bf{r}}(t)= \langle 4,0,8 \rangle +t \langle 1,0,1 \rangle\\
= \langle 4+t,0,8+t \rangle.$$
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