Answer
Infinitely many direction vectors.
Work Step by Step
By definition, a direction vector for the line is a vector that is parallel to that line. Therefore, there are infinitely many direction vectors to the line.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 13 - Vector Geometry - 13.2 Vectors in Three Dimensions - Preliminary Questions - Page 658: 5
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