A variable means to decrease it's value by something%
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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.
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For two variables that are inversely related, if one variable is doubled, the other variable will decrease to half of its original value. This is because the product of the two variables remains constant when they are inversely related. Therefore, doubling one variable results in a proportional decrease in the other variable to maintain that constant relationship.
In mathematics, the expression "2a" represents the product of 2 and the variable "a." This means that you are multiplying the number 2 by the value of the variable "a." The result will depend on the specific value assigned to the variable "a."
In mathematics, a variable is a representation, in the form of a letter, of a numerical value. Variables are traditionally used when the value it represents is either unknown or can vary.