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A variable is something that represents, or stands in for something unknown, for example a number. You could be given the math problem 6 + x = 9, in which you would have to figure out what the variable is, which, in this situation, is x.
The dependent variable.
The dependent variable is the variable that depends on the independent variable.
the test variable is the independent variable.
In science examining and experimenting on systems involves managing the accounting the factors that effect them. In a carefully controlled set of duplicate experiments when one situation differs is known as a variable. A variable can change the experimental outcome.