Answer
$r = \frac{4}{cos~\theta+2~sin~\theta}$
Work Step by Step
$x+2y = 4$
$r~cos~\theta+2r~sin~\theta = 4$
$r = \frac{4}{cos~\theta+2~sin~\theta}$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 8 - Review Exercises - Page 406: 69
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