12. If two quantities x and y are in inverse proportion, then the relation between x and y must be (A) xy = 1 = (B) xy = k, k being a constant = (C) 1 {D)=k, k being a constant. (if you will give wrong answer report + block)
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Since, two quantities x and y are said to be in Inverse proportion, if an increases in x cause a proportional decreases in y and vice-versa, in such a manner that the product of their corresponding values remains 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 an inverse variation, then xy = constant. The value of a variable is not constant and keeps on changing.
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