Two quantities x and y are said to be in direct proportion if (a) xy = k (b) = k (c) both (a) , (b) (d) none
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Solution. (a) If two quantities x and y vary directly with each other, then \frac { x }{ y } = k = constant. Since, in direct proportion, both x and y increases or decreases together such a manner that the ratio of their corresponding value remains constant.
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directly proportion x=y
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