a is directly proportinal or inversely proportional to b
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use the formula y=kx
yes y=kx is the formula for direct variation, and k represents constant of variation which can also be called slope.
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.
A direct variation (!) or direct reelationship.
No, it is not a direct variation.