## Thomas' Calculus 13th Edition

Published by Pearson

# Chapter 14: Partial Derivatives - Section 14.1 - Functions of Several Variables - Exercises 14.1 - Page 787: 14

See image. .

#### Work Step by Step

Equate $f(x,y)=c$ for each value of c For c=0, $x^{2}+y^{2}=0\qquad$ is the origin. For the other values of c: we have circles about the origin with radii $1,2,3,4,5$

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