Final answer:
The axis of a graph is used as a scale to plot data, representing the independent and dependent variables. It provides a starting point with equal intervals that follow.
Step-by-step explanation:
The axis of a graph is used as a scale to plot data. It consists of two perpendicular lines, the x-axis and the y-axis. The x-axis represents the independent variable, which is the variable that is controlled or manipulated, while the y-axis represents the dependent variable, which is the variable that changes with the value of the independent variable. The axis provides a starting point with equal intervals that follow, allowing for accurate representation of data on the graph.