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A dependent variable is determined by the independent variable for a relation.
\The value of the dependent variable depends on the value of the independent variable.
\The value of the independent variable is independent value of the dependent variable.
\Consider, A relation that relates the amount of medication in your blood stream over time.
\Here Time is the independent variable since time has no control upon the system.
\The amount of medication in your blood stream is the dependent variable.because it depends on the time.
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The value of the dependent variable depends on the value of the independent variable.
\The value of the independent variable is independent value of the dependent variable.