Definition

Inverse Variation

For any two variables xx and yy, the variable yy varies inversely with xx if their relationship can be expressed as

y=kx,where k0y = \frac{k}{x}, \quad \text{where } k \neq 0

The nonzero constant kk is called the constant of variation. In an inverse variation, as one variable increases the other decreases, and vice versa. The term "inverse" refers to the multiplicative inverse (reciprocal): since the multiplicative inverse of xx is 1x\frac{1}{x}, the inverse variation formula can be understood as yy equaling a constant times the reciprocal of xx. This stands in contrast to direct variation, where y=kxy = kx and both variables increase or decrease together.

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Updated 2026-05-01

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