Answer
See image:
Work Step by Step
Level curves have the form:
$\sqrt{x}+y=k$
$y=-\sqrt{x}+k$
Multivariable Calculus, 7th Edition
by Stewart, James
Published by
Brooks Cole
ISBN 10:
0-53849-787-4
ISBN 13:
978-0-53849-787-9
Chapter 14 - Partial Derivatives - 14.1 Exercises - Page 914: 45
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