Answer
Please see the figure attached.
Work Step by Step
The isotherms are obtained by plotting the surfaces:
$T = \frac{{{x^2}}}{4} + \frac{{{y^2}}}{9} + {z^2}$, ${\ \ \ }$ for $T = 0,1,4$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 15 - Differentiation in Several Variables - 15.1 Functions of Two or More Variables - Exercises - Page 765: 53
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