It is the x axis and y is the vertical axis whereas both axes intersect each other at right angles at the point of origin which is (0, 0)
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Horizontal axis.
The x-axis
The word abscissa can either refer the horizontal axis (the x-axis) in a cartesian coordinate system or the actual coordinate plotted on the horizontal axis.
The combination of a horizontal axis and a vertical axis is called a Cartesian coordinate system, or in short, a graph.
The z axis in the vertical axis in the Cartesian Coordinate System.