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Math Help - solve for x problem

  1. #1
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    solve for x problem

    stuck on this on

    s = a / l-r

    solve for r

    also how do you make a divide a straight line in this forum?
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  2. #2
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    multiply both sides by l - r

    s(l - r) = a
    sl - sr = a

    rearrange
    sl - a = sr

    sr = sl - a

    divide both sides by s

    r = l -a/s

    I think
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  3. #3
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    Quote Originally Posted by Joel View Post


    multiply both sides by l - r

    s(l - r) = a
    sl - sr = a

    rearrange
    sl - a = sr

    sr = sl - a

    divide both sides by s

    r = l -a/s

    I think

    s = a
    divide
    1 - r
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  4. #4
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    Quote Originally Posted by realistic View Post
    s = a
    divide
    1 - r
    Huh?

    Do you mean s = a / (l - r)
    What you posted means s = (a/l) minus r
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  5. #5
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    Quote Originally Posted by Wilmer View Post
    Huh?

    Do you mean s = a / (l - r)
    yeah this


    like i had in original post
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  6. #6
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    Quote Originally Posted by realistic View Post
    yeah this

    like i had in original post
    Ok; so a = l(s + r)
    a = ls + lr
    Can you not finish it?
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  7. #7
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    Quote Originally Posted by Wilmer View Post
    Ok; so a = l(s + r)
    a = ls + lr
    Can you not finish it?
    the answer is r = s-a/s In the book i have

    anyone know how to get this answer ?
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  8. #8
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    Quote Originally Posted by realistic View Post
    the answer is r = s-a/s In the book i have

    anyone know how to get this answer ?
    If you learn to use the LaTex markup tags and that will help make things more clear in the future. You would enter \frac{a}{1-r} between the "math" tags.

    Anyway,

     s=   \frac{a}{1-r}

    Multiply both sides by 1-r

     s(1-r) = a

    Use distributive law

     s - sr = a

    Subtract both sides by s

     -sr = a - s

    Almost there, now divide both sides by -s (minus s)

     r = \frac{a - s}{-s}

    All the cool kids move the negative sign up from the denominator

     r = \frac{-(a - s)}{s}

    Distributing the minus sign (which is really a -1)

     r = \frac{-a + s}{s}

    Now rearranging the numerator so the positive term comes first

     r = \frac{ s - a}{s}
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  9. #9
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    ok thanks i see now
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