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You choose the values of the independent variable. The dependent variable is the one you measure.
Independent variables can take values within a given boundary. The dependent variable will take values based on the independent variable and a given relationship at which the former can take its values.
the independent variable is usually assigned to x the dependent variable is usually assigned to y their values will vary because they are variables. that is the definition of variable
An independent variable can be any of a given set of values while a dependent variable is represented as a function of another variable.
The dependent variable depends on the independent variable for its values as for example in the straight line equation y = 2x+6 whereas y is the dependent variable and x is the independent variable