they are bother variable and they both make-up a graph or table
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80 is neither dependent nor independent. It is a number: a variable can be dependent or independent, not a constant.
Independent and dependent variables are graphed on the axes of a rectangular grid (e.g. graph paper). The important thing is to understand which is which. The independent variable is graphed on the horizontal (x-) axis. In an experiment you choose values of the independent variable and measure the values of the dependent variable (it "depends' on the other). The dependent variable is graphed on the vertical (y-) axis.
An independent variable is a factor that doesn't rely on anything, unlike the dependent variable (which relies on the independent variable). The most common independent variable is time.
Dependent and independent and what scenario
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.