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Activity
Other

Jiskha Math Homework Help: Direct and Indirect Variations

For Students 9th - 10th Standards
Jiskha.com offers math homework help that provides a general overview of direct and indirect variation, including a few simple graphing examples.
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Handout
Wolfram Research

Wolfram Math World: Direct Proportion

For Students 9th - 10th
MathWorld offers a concise mathematical definition of direct variation or direct proportion.