Precalculus with Limits: A Graphing Approach, Sixth Edition
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Precalculus with Limits: A Graphing Approach, Sixth Edition View details
4. Lines and Planes in Space
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Exercise 1 Page 740

A vector parallel to a line shows the direction of the line.

direction

We want to complete the sentence.

The vector for a line L is parallel to line L.

Let's take a look at a line in the space and a vector parallel to this line.

Any vector that is parallel to a line shows the direction of the line. Therefore, we call such a vector a direction vector. Let's fill in the blank.

The direction vector for a line L is parallel to line L.