The x-axis.
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On the Cartesian plane the horizontal number line is the x axis.
Cartesian plane
The horizontal line is the x axis and the vertical line is the y axis.
That's the name of the plane with the horizontal x-axis and the vertical y-axis on which equations and inequalities with two variables are graphed. The Cartesian coordinate plane is to two dimensions as the number line is to one dimension.
On the Cartesian plane the x line is the horizontal axis and the y line is the vertical axis.