It is the y axis and the horizontal number line is the x axis and both axes meet at the point of origin at (0, 0)
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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.
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)
A vertical line in the xy coordinate plane would represent the line of an equation such as x = 1 or x = -4.
The y coordinate is the vertical number line on the Cartesian plane that intersects with the horizotal x coordinate number line at right angles at the point of origin whose coordinates are (0, 0)
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.