A variable is usually assumed to represent an unknown quantity. You don't need to "do" anything special to your variable.
A variable is assigned to represent an unknown quantity.
Variable: A letter or symbol used to represent a number or quantities that vary
A variable is usually assumed to represent an unknown quantity. You don't need to "do" anything special to your variable.
A variable is usually assumed to represent an unknown quantity. You don't need to "do" anything special to your variable.
choosing
mathematicschoosing a variable to represent an unknown quantity
It can represent anything. When stating a specific problem, you should clarify what each variable represents.
define
any number at all
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X-Axis is manipulated variable. Y-Axis is responding variable