Sep 06, 2016 · Vectors - equation of a line through two points : ExamSolutions - Duration: 7:44. ExamSolutions 118,912 views The part of a line that connects two points. It is the shortest distance between the two points. It has a length. Adding the word "segment" is important, because a line normally extends in both directions without end.

A one dimensional figure, such as a line or line segment cannot be written in a single equation in three dimensions. You can write three parametric equation in a single parameter or write it in "symmetric" form.