On the Cartesian plane the horizontal number line is the x axis.
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It is called the x axis and the vertical number line is the y axis
In the co-ordinate plane The horizontal number line is the 'x-axis'. The vertical number line is the y-axis. They intersect at the 'origin' ; coordinate (0,0) In the 3-dimensional system there is a third number line going from front to back , this is the z-axis. All three axes intersect at the origin , and have the the coordinates ( x,y,z) = (0,0,0)
Coordinate plane
abscissa is horizontal and ordinate is vertical one
A horizontal line would be of the form y= (a number). There should be no 'x's involved in the equation.