It's known as the X-axis. Most of the time used for the Independent Variable. Also used for the run (if on a Cartesian Plane) if doing slope. It does not have a Direct Definition, but is called the X-axis.
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The one that runs left to right, you mean..
On a graph, a horizontal line reprents no change in data.
Yes the graph of a function can be a vertical or a horizontal line
It means that the object in question is moving at a constant speed.If the graph is a straight horizontal line, then the speed is zero.
Assuming it is a spped v/s time graph, a horizontal line represents motion at a constant speed.