The equation is xy = k where k is the constant of variation.
It can also be expressed y = k over x where k is the constant of variation.
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It is difficult to be certain. Limitations of the browser used by Answers.com means that we cannot see most symbols. Please resubmit your question spelling out the symbols as "plus", "minus", "equals". If the question is about xy = 7, then it is an equation of an inverse relationship. This is NOT the same as an inverse equation.
The opposite is a direct relationship.
The equation is xy = 22.5
The inverse variation is the indirect relationship between two variables. The form of the inverse variation is xy = k where k is any real constant.
decreases