Answer
X-axis.
Work Step by Step
Here, the equations are $y=0,z=0$ and the set of points that satisfies such equations has the line passing through the point of coordinates $(0,0,0)$ which are parallel to the x-axis.
University Calculus: Early Transcendentals (3rd Edition)
by Hass, Joel R.; Weir, Maurice D.; Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0321999584
ISBN 13:
978-0-32199-958-0
Chapter 11 - Section 11.1 - Three-Dimensional Coordinate Systems - Exercises - Page 599: 3
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