The horizontal number line on a coordinate plane is called the x-axis, and the vertical number line on a coordinate plane is called the y-axis.
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Horizontal, vertical, lateral
The horizontal line on the coordinate plane is the x axis and is usually in the form of a number line that meets the vertical y axis number line perpendicularly at the point of origin which is at (0, 0)
This point is the origin.
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.
The vertical and horizontal lines that make up the quadrants of a coordinate plane.