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Math Help - simultaneous Equation, i have the answers but cannot seem to get to them

  1. #1
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    simultaneous Equation, i have the answers but cannot seem to get to them

    Hi all,

    I have the following equations;

    0 = A - (B/(50^2))
    -8 = A - (B/(75^2))

    with the answers as follows;

    B = -36000
    A = -14.4

    I think i may be failing somewhere with my rearranging of the formulas to subtract one from the other.

    Any ideas?
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  2. #2
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    Re: simultaneous Equation, i have the answers but cannot seem to get to them

    Quote Originally Posted by moleman87 View Post
    Hi all,
    I have the following equations;
    0 = A - (B/(50^2))
    -8 = A - (B/(75^2))
    Rewrite them as:
    50^2A - B=0
    75^2A -B= -8\cdot 75^2
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  3. #3
    MHF Contributor

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    Re: simultaneous Equation, i have the answers but cannot seem to get to them

    Quote Originally Posted by moleman87 View Post
    Hi all,

    I have the following equations;

    0 = A - (B/(50^2))
    -8 = A - (B/(75^2))
    What do you get if you subtract the second equation from the first?
    0- (-8)= 8, of course, and A- A= 0. So what is -B/50^2- (-B/75^2)? (50= 25(2) and 75= 25(3). So 50^2= 25^2(4) while 75^2= 25^2(9). The common denominator is 25^2(4)(9).

    with the answers as follows;

    B = -36000
    A = -14.4

    I think i may be failing somewhere with my rearranging of the formulas to subtract one from the other.

    Any ideas?[/QUOTE]
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