Answer
See below.
Work Step by Step
No, because $x$ can also be defined as a function of $y$. E.g.$\frac{x}{9}-\frac{y^2}{9}=1$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 7 - Conic Sections - Exercise Set 7.2 - Page 687: 85
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