Explain the difference between dependent and independent variables

Dependent variable means it not part of the expression and independent only is part with only one part of expression

An independent variable is a variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable.

A dependent variable is a variable being tested and measured in a scientific experiment.

The dependent variable is dependent on the independent variable. As the experimenter changes the independent variable, the effect on the dependent variable is observed and recorded.