if two quantities 'x' and 'y' then xxy=k (constant)
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if two quantities x and y vary (change) in such a manner that an increase in x causes a proportional decrease in y (and vice versa), then x and y are said to be inverse proportion.
- • If x and y are in a direct proportion, then
- • If x and y are in an inverse variation, then xy = constant.
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