Answer
we put $f(x,y)=z_0$
Work Step by Step
to graph the level curves of a surface $z = f(x, y)$ we have to fix $z$, so we put $z=z_0$ and then we graph the function $f(x,y)=z_0$ in the xy-plane.
Calculus: Early Transcendentals (2nd Edition)
by Briggs, Bill L.; Cochran, Lyle; Gillett, Bernard
Published by
Pearson
ISBN 10:
0321947347
ISBN 13:
978-0-32194-734-5
Chapter 12 - Functions of Several Veriables - 12.2 Graphs and Level Curves - 12.2 Exercises - Page 882: 6
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