The distance $d$ of a point $P$ to the line through points $A$ and $B$ is the length of the component of $\overline{AP}$ that is orthogonal to $\overline{AB}$, as indicated in the diagram.

So the distance from $P = \left(-3,2,-1\right)$ to the line through the points $A = \left(-3,1,-3\right)$ and $B = \left(3,5,0\right)$ is .