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Inverse Variation
Inverse Proportion
Inversely Proportional

A relationship between two variables in which the product is a constant. When one variable increases the other decreases in proportion so that the product is unchanged.

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

Equation: y = 60/x

y is inversely proportional to x.

Doubling x causes y to halve. The product of x and y is always 60.

 x y 3 20 6 10 12 5

 this page updated 15-jul-23 Mathwords: Terms and Formulas from Algebra I to Calculus written, illustrated, and webmastered by Bruce Simmons Copyright © 2000 by Bruce Simmons All rights reserved