In 2-dimensions, it is the y-axis.
In 3-dimensions, though, the x and y axes form the horizontal plane and the z-axis is the vertical axis.
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The horizontal line is the x axis and the vertical line is the y axis.
The z axis in the vertical axis in the Cartesian Coordinate System.
The vertical y axis on the Cartesian plane is both negative and positive
It is the vertical number line on the y axis in the Cartesian plane
The y-axis is the vertical line that is perpendicular to the horizontal line of the x-axis on the Cartesian plane