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Math Help - Problems with signs

  1. #1
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    Problems with signs

    105= 99 (100+y) + 1

    Y= ?


    Thw solution says 6.06, but i run into difficulty deriving this, Can anyone help
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  2. #2
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    The solution is wrong

    The solution is wrong.

    105= 99 (100+y) + 1
    104 = 99(100+y)
     \frac {104}{99} = 100+y
    y = \frac {104-9900}{99}
    y = \frac {-9796}{99}
    Last edited by badgerigar; December 10th 2007 at 02:35 AM. Reason: forgot math tags
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  3. #3
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    the sol says;

    (105-99)/99=.0606

    so he moves 99 across to deduct from 105, but i cant see whys hed dividing by 99......
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  4. #4
    Bar0n janvdl's Avatar
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    Quote Originally Posted by flynne8 View Post
    the sol says;

    (105-99)/99=.0606

    so he moves 99 across to deduct from 105, but i cant see whys hed dividing by 99......
    Where does this come from? (105-99)/99=.0606

    You can't just "move it across".

    Badgerigar's solution seems correct.
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  5. #5
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    The Q is; 105 = 99 * (100+y) + 1

    and gives the sol;

    y=(105-99)/99=6.06%

    ?????
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  6. #6
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    Quote Originally Posted by flynne8 View Post
    The Q is; 105 = 99 * (100+y) + 1

    and gives the sol;

    y=(105-99)/99=6.06%

    ?????
    The solution is wrong.. subtract one from both sides and you have: 104=99(100+y).

    Now, divide both sides by 99..

    \frac{104}{99}=100+y

    Subtract 100 from both sides...

    y = \frac{104}{99}-100
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