Answer
Negative number
Work Step by Step
The number r is an x-coordinate. Thus, because this coordinate is left of the origin, it follows that r is negative, for all x-coordinates left of the origin are negative.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 10 - Section 10.3 - Preparing to Do Analytic Proofs - Exercises - Page 474: 30a
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