direct variation

Direct Proportion
Direct Variation
Directly Proportional

A relationship between two variables in which one is a constant multiple of the other. In particular, when one variable changes the other changes in proportion to the first.

If b is directly proportional to a, the equation is of the form b = ka (where k is a constant).


Equation: y = 4x

Variable y is directly proportional to x.

Doubling x causes y to double. Triplingx causes y to triple.




See also

Inverse variation, joint variation, gravity

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