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Math Help - Algebra

  1. #1
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    Algebra

    This came from one of the questions from my math test...

    7M+3B=4700
    3M+5B=4800

    difference between B+M = 400


    Pls help urgently. Thanks.


    Anna


    P.S sorry, I just realised I posted in the wrong thread... could any of the mods please help with this?
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  2. #2
    MHF Contributor Amer's Avatar
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    Quote Originally Posted by AnnaRydell View Post
    This came from one of the questions from my math test...

    7M+3B=4700
    3M+5B=4800

    difference between B+M = 400 the difference or the sum


    Pls help urgently. Thanks.


    Anna


    P.S sorry, I just realised I posted in the wrong thread... could any of the mods please help with this?
    you want to find the value of B and M right ??

    7M+3B=4700.....(a) multiply with -3

    3M+5B=4800.....(b) multiply with 7



    -21M+-9B=-14100 ......(1)

    21M+35B = 33600 ......(2)

    the sum of (1) and (20

    26B=19500

    B=750

    sub B value in (b)

    3M+5(750)=4800

    M=350

    the difference between them 750-350=400
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  3. #3
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    To state clearly...B-M = 400

    The question asked for B but its okay I know now yeah... Thanks Amer!

    Anna
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  4. #4
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    Quote Originally Posted by AnnaRydell View Post
    difference between B+M = 400
    This is not required in order to solve.
    Hope you realise that.
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  5. #5
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    Quote Originally Posted by AnnaRydell View Post
    This came from one of the questions from my math test...

    7M+3B=4700
    3M+5B=4800

    difference between B+M = 400


    Pls help urgently. Thanks.


    Anna


    P.S sorry, I just realised I posted in the wrong thread... could any of the mods please help with this?
    7m+3b=4700
    If you multiply 4700 with 5 (take the answer as y), you will get the answer for 35m+15b.

    3m+5b=4800
    If you multiply 4800 with 3 (take answer as x), you will get the answer for 9m+15b.

    Then, you subtract x by y (take answer as a).

    Then, divide a by 32 to find m.
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