The constant of variation in an http://wiki.answers.com/Q/inverse-variation.html is the constant (unchanged) product between two variable quantities.The formula for indirect variation is xy = k..where k is the constant of variation.
The constant of variation in a http://wiki.answers.com/Q/direct-variation.html is the constant (unchanged) ratio of two http://wiki.answers.com/Q/variables.html quantities. The formula for direct variation is y = kx..where k is the constant of variation.
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Y=k/x where k is the constant of proportionality is an example of indirect or inverse variation. They are the same thing.
No, it is not a direct variation.
measures of variation
No, indirect questions do not require question marks.
There are infinitely many types of variation.