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Thread: [RESOLVED] Check my answer, thanks! =)

  1. Sep 13th, 2007, 11:44 PM #1
    Yunie
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    Resolved [RESOLVED] Check my answer, thanks! =)

    It is given that y varies inversely as x and y=20 when x=40

    a) if x increased by 50%, find the percentage change in y.


    I have worked out the solution, my answer is 33.3...%, is that correct?
    I really want to do well in maths. Please help and tolerate my stupidness.

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  2. Sep 14th, 2007, 04:38 AM #2
    krtxmrtz
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    Re: Check my answer, thanks! =)

    Your solution is correct... except that it's a decrease, so it requires a minus sign: -33.333...%

    ...and you don't even need to know that y=20 when x=40, it's irrelevant.
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  3. Sep 16th, 2007, 11:50 PM #3
    eranga262154
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    Re: Check my answer, thanks! =)

    ye, krtxmrtz is right. If your parameters are inversely combined on each other, there should be a - sign. Because one parameter is increasing the other related parameter should be decrease.

    Quote Originally Posted by krtxmrtz
    ...and you don't even need to know that y=20 when x=40, it's irrelevant.

    Most of the time people confusing with those tricky points.
    Last edited by eranga262154; Sep 16th, 2007 at 11:53 PM. Reason: Incomplete
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  4. Sep 19th, 2007, 09:38 PM #4
    Yunie
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    Re: Check my answer, thanks! =)

    Thanks guys!
    I really want to do well in maths. Please help and tolerate my stupidness.

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