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Two quantities x and y are said to be in direct proportion if whenever the value of x increase (or decrease), then the value of y increases (or decrease) in such a way that the ratio x/y remains constant.

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9y ago

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Two variables, X and Y are in direct proportion if Y = kX where k is a constant of proportion.


This requires that if one of x and y is 0, then so is the other, and that for every unit increase in x, y increase by k.

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12y ago
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Q: What is a direct proportion?
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