Take the expression y = f(x) where f is a function relating y in terms of x.
x is the input - the independant variable.
y is the output - the dependant variable because it's value depends on x.
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Any variable can be declared as the independent variable, then the other would be the dependent variable. However, it is quite common to arbitrarily define y as the dependent variable - a variable that depends on x.
is dependent on the independent variable
Free from outside control means Independent . While dependent Is opposite.
dependent variable
The independent variable.