The constant of variation is the nonzero constant relating two variables in an equation
that models how one variable varies with the other.
In a direct variation,
the constant is 
.
In an inverse variation,
it is 
.
Thus the constant of variation fixes the scale of the proportional
relationship.
See also
Direct Variation,
Directly
Proportional,
Inverse Variation,
Proportional
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References
OpenStax. "Modeling Using Variation." In College
Algebra 2e. Houston, TX: OpenStax, 2021. https://openstax.org/books/college-algebra-2e/pages/5-8-modeling-using-variation.
Cite this as:
Weisstein, Eric W. "Constant of Variation."
From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/ConstantofVariation.html
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