Not necessarily.
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Cross-tabulation or two-way tabulation.
Use a variable to represent the situation. For example: John is 10 years older than Frank. Frank would be represented by x John is x+10
The variable x. If there is an independent variable it would be placed on the x axis but there need not be one.
The constant variable is usually the 'X' variable or the variable that stays the same. For example, it may be the 'X' variable or the same number.
It is called the independent variable. For example if you are trying to find y: y = x+1 X is the independent variable, and Y is the dependent variable. The value of Y, depends on the value of X.