Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 9 - Polar Coordinates; Vectors - Chapter Review - Chapter Test - Page 636: 20

Answer

$v_1$ and $v_4$

Work Step by Step

If a vector $v$ can be obtained by multiplying a vector $w$ by a constant, then $v$ and $w$ are parallel. If the dot product of two vectors is $0$ then they are orthogonal. $\frac{5}{2}(4i+6j)=10i+15j$, hence $v_1$ and $v_4$ are parallel.
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