## Calculus (3rd Edition)

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