#### Answer

x-axis

#### Work Step by Step

RECALL:
In a Cartesian coordinate system, the horizontal number line is called the x-axis while the vertical number line is called the y-axis.
Thus, the missing expression in the given statement is:
x-axis

Published by
Pearson

ISBN 10:
0321867327

ISBN 13:
978-0-32186-732-2

x-axis

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