Answer
a. $B$
b. $VI$
Work Step by Step
In the xz (y=0) and yz (x=0) planes, traces are parabolas. This is graph B.
Level curves:
when $x=\pm 1$ or $y=\pm 1$, z is zero,
(no level curve crosses these lines)$\rightarrow$(VI)
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 915: 63
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