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Quandaries & Queries
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 Topic: proportionality
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 If x ix directly proportional to y then ... 2012-02-19 From Crystal:I understand that we say x and y are proportional, then y = kx. Generally when we say x is proportional to y, we think that when x increases y increases. Now I am questioning whether that is actually true. If k is negative, then when x increases, y DECREASES. My question is does this mean this statement is incorrect: If x is proportional to y, when x increases, y increases proportionally. Is it more correct to say: If x is proportional to y, when x increases, y either increases proportionally or decreases proportionally. Along the same line of reasoning, when x is inversely proportional to y, we think that when x increases y decreases, but that is true only if k is positive. Is that correct?Answered by Harley Weston. Proportionality 2009-11-03 From Nazrul:If x is proportional to y , how can I prove that (x^2-y^2) is proportional to xy. Please explain the process.Answered by Penny Nom. Proportionality 2009-06-29 From Nazrul:If x is proportional to y and y is proportional to z , how can I prove that (x^2+y^2)^3/2 is proportional to z^3Answered by Harley Weston. Proportionality: direct and indirect 2001-01-18 From Nancy Ellis:What is the difference between directly proportional and indirectly proportional?Answered by Leeanne Boehm.

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