They can be - in a horizontal bar graph or a population pyramid.
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A vertical number line
Horizontal line (left to right) is the x-axis and the vertical line (up and down) is the y-axis.
The convention for an x-y graph is as follows: y | | |_____ x where the x-axis is horizontal and the y-axis is vertical.
If you are graphing the results of an experiment, the dependent variable is on the vertical, or y-axis, and the independent variable is on the horizontal axis, or x-axis.
It is the Y-axis.