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Topic: Direct Variation/Proportion
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Ron Vavrinek

Posts: 17
Registered: 12/6/04
Direct Variation/Proportion
Posted: Sep 21, 1995 3:26 PM
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We are having a discussion about direct variation and direct proportion.

Math teachers frequently refer to a variable being directly proportional to
a function if y = k g(x). For example, the volume of a cylinder with a
fixed height is directly proportional to the square of its radius.

The question is: Are direct proportion and direct variation the same thing
or is direct variation restricted to items of the form: y = kx?

Ron Vavrinek Illinois Mathematics and Science Academy
Math Team Leader 1500 W. Sullivan Road Aurora, IL 60506
(708) 907-5964

"Even if you are on the right track, you'll still get run over if you just
sit there." Will Rogers

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