Answer
$$3x+4z=5.$$
Work Step by Step
To obtain the trace of the plane in the $ xz $-plane, we set $ y=0$ and hence
$$3x+4z=5.$$
So the line $3x+4z=5$ is the trace of the plane $3x-9y+4z=5$ in the $ xz $-plane.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 13 - Vector Geometry - 13.5 Planes in 3-Space - Exercises - Page 685: 44
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