You can put this solution on YOUR website! All linear relationships have a variable and a constant. They can be expressed in a graph where the two are connected with a straight line. It can also be expressed in a mathematical format.
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The constant is a number (5, 7, 12, whatever) and the variable is usually x and/or y.
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Take for example: y = 2x+6 The 2 is called a coefficient, it modifies the variable x, and 6 is a constant.
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John