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Math Help - Solving for a varible

  1. #1
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    Solving for a varible

    I have an equation filled with variables, needing to solve for just one of them..



    S = n*a + (n - 1)*d , solve for n

    * = multiplication

    what on earth do I do for this?
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  2. #2
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    e^(i*pi)'s Avatar
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    You can use the distributive property on (n-1)d which is nd-d

    Once you've done that collect any terms with n in on one side and those without on the other side - this means you'll be able to factor out the common factor n
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  3. #3
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    Ok I think I may have figured it out... Just to be clear:


    1) distribute the d through (n-1) to make your equation

    S = na + dn - d

    2) pull out the n from na and dn to make

    S = n(a + d) - d

    3) now divide both sides by a + d to get

    S/a+d = n - d

    4) then add d to both sides to get the final answer of...

    n = S + d/a + d

    right?
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  4. #4
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    Quote Originally Posted by gurrry View Post
    Ok I think I may have figured it out... Just to be clear:


    1) distribute the d through (n-1) to make your equation

    S = na + dn - d

    2) pull out the n from na and dn to make

    S = n(a + d) - d
    Add 'd' to both sides here..
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