Whenever you graph a function where one value is dependent on another in some proportional mathematical way, you represent the independent variable on the horizontal axis and the dependent value on the vertical axis. For example, if a person makes $8 per hour, then you would show hours 0, 1, 2, 3, 4,...etc. on the horizontal (x-axis) axis and the corresponding totals earned for each of the hour values (the values 0, 8, 16, 24, 32...etc - the dependent variable) along the vertical (y-axis) axis.
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The horizontal axis of a typical graph would be the "X-axis"
x axis
The graph is called a corrdinate plane. The horizontal is called the x-axis. The verticle is the y-axis.
The independent variable goes on the horizontal (x) axis.
distance-time graph