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).
Variable y is directly proportional to x. Doubling x causes y to double. Triplingx causes y to triple. 

See also
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