1 Answer

Fah · Answer 1 · 2018-03-07T02:27:27+0000

$\mathbf x(t)=\langle -9,-3,t\rangle$

should do it. The

and

coordinates of any point on the line are fixed, and since only the

coordinate changes, this line is vertical. And of course, when
t=9

, the line passes through the point
(-9,-3,9)

.

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