Direct Variation

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In direct variation (or direct proportion) an increase or decrease in one quantity results in a proportional increase or decrease in the other.

For example, if one quantity is doubled the other will be doubled and if one quantity is halved, the other will also be halved.

For example:

If y varies directly as x , then \( \scriptsize y \propto x \)

The symbol \( \scriptsize \propto\)means

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