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Math Help - Proportions

  1. #1
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    Proportions

    I just wanted to make sure I got this problem correctly http://img109.imageshack.us/img109/7831/91757261.png
    I got x = 5 did I do this one correctly?

    Also I need help on a problem that looks like this http://img109.imageshack.us/img109/7831/91757261.png

    I don't know how to set up a proportion for that one, so can anyone help me with this? Thanks.
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  2. #2
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    Quote Originally Posted by Jubbly View Post
    I just wanted to make sure I got this problem correctly http://img109.imageshack.us/img109/7831/91757261.png
    I got x = 5 did I do this one correctly?

    Also I need help on a problem that looks like this http://img109.imageshack.us/img109/7831/91757261.png

    I don't know how to set up a proportion for that one, so can anyone help me with this? Thanks.
    looks like your two links are the same one.....
    here is the proportion:

    \frac{x}{x+5} = \frac{2x-8}{x+8} (= 1:1)

    x(x + 8) = (2x - 8)(x + 5)
    x^2 + 8x = 2x^2 + 10x - 8x - 40
    x^2 - 6 - 40 = 0
    (x - 10)(x + 4) = 0
    x = 10 or x = -4
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