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The independent variable. The output variable is dependent on this variable's value and so is called the dependent variable.
You cannot plug in a variable, what you do is plug in the value for a variable. If you know the value of the variable in an equation (or formula), the process of replacing that variable whenever it appears in the equation by its value is called plugging in the value for the variable.
the variable
A dependent variable is simply a variable (for example: y) whose value depends on that of another.
A variable can have lots of different values - as opposed to a constant which has only one. That is why it is called a variable!