I define an variable by saying x- an value
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State what the variable represents in the equation.
Declaration is a promise: 'I will define (or has defined) this variable/function somewhere else'.
int x; "Example"
Can't really say. X is a variable and untill you define that variable, it can't be answered.
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.