What is the horizontal axis on a graph called?

The horizontal axis on a graph is referred to as the X-axis. This axis typically represents the independent variable in a graph, which is the variable that is manipulated or controlled in the context of a given experiment or analysis. In most standard graphing conventions, the X-axis runs left to right, making it easy to plot points along this line based on the values of the independent variable.

In mathematical terms, the X-axis is crucial for determining the position of points or data, helping to visualize relationships between different sets of data. Understanding the significance and usage of the X-axis is fundamental in fields ranging from mathematics and statistics to various scientific disciplines.