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problem on inequality & exponent

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alfat Just gettin' started! Default Avatar
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problem on inequality & exponent Post Fri Mar 09, 2012 8:24 pm
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  • Lap #[LAPCOUNT] ([LAPTIME])
    if (x-5)(y+2)=0 which of the following must be true?(A)X=Y (b) X>Y (C)X<Y (d)XY=-10 e.none of th above

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    Post Sun Mar 11, 2012 8:19 am
    alfat wrote:
    if (x-5)(y+2)=0 which of the following must be true?(A)X=Y (b) X>Y (C)X<Y (d)XY=-10 e.none of th above
    If (x-5)(y+2)=0, then we can conclude that x = 5, or y = -2, or both

    (A)X=Y This need not be true. For example, one solution could be x=5, y=6
    (B) X>Y This need not be true. For example, one solution could be x=5, y=6
    (C)X<Y This need not be true. For example, one solution could be x=5, y=3
    (D)XY=-10 This need not be true. For example, one solution could be x=5, y=6
    (E)none of the above.

    So, the correct answer must be E

    Cheers,
    Brent

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