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A variable changes. It varies.

A non variable does not change. It is constant.

For example if I write a mathematical expression such as x + 1, then x is a variable. Its value can be whatever value we choose. However 1 is a non variable. Its value is 1 and never changes from 1.

In a scientific experiment a variable would be something that you changed from one test to another. A non variable would be something that remained constant from test to test.

As a final example: the speed at which light travels in a vaccum is a constant. It is referred to by the letter c which stands for the universal constant. However, the speed at which your car travels is a variable. It changes.

Q: What is the difference between a variable and a non variable?

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The difference between a variable resistor and a rheostat is the same as the difference between six and half a dozen.

The variable.

a literal is a constant value, the difference is a variable can change it's value.

The set of the possible values.

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Table The difference in the values of the "dependent" variable is a fixed multiple of the difference between the corresponding values of the independent variable. And the value of the dependent variable is non-zero when the independent is zero.Graph A non-vertical straight line which does not pass through the origin.Equation y = mx + c (or equivalent) where m is some real number and c is non-zero.