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Math Help - ruler postulate problem on coordinates of line

  1. #1
    rcs
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    ruler postulate problem on coordinates of line

    B, C, and E are three points on a line such that B - E - C. The coordinate of E is - 7 and the coordinate of C is greater than that of coordinated of B. if BC = 19 and CE = 8, find the coordinates of B and C. (use algebraic method)

    BE + EC = BC
    BE + 8 = 19
    BE = 19 - 8 = 11

    Solve: for coordinate B.

    |B - E| = 11
    |B - (-17) | = 11
    - (B - (-7)) = 11
    B + 7 = - 11
    B = - 11 - 7
    B = - 18....


    i am in finding coordinate of C. because | C - E | = 8 then C - (-7) = 8 and C + 7 = 8 will C = 8 - 7 = 1... is this correct sir?


    thanks
    Last edited by rcs; August 5th 2012 at 09:37 AM.
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  2. #2
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    Re: ruler postulate problem on coordinates of line

    draw a number line sketch to check your solutions ...
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  3. #3
    rcs
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    Re: ruler postulate problem on coordinates of line

    i guess it is
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    Re: ruler postulate problem on coordinates of line

    Quote Originally Posted by rcs View Post
    i guess it is
    What do you mean "i guess" ??? Either you've confirmed the solution or you have not, there is no "guess" to it.

    Start taking ownership of your own math work ... that means checking your own answers before asking someone else to do it for you.
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  5. #5
    rcs
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    Re: ruler postulate problem on coordinates of line

    i mean i got it right. thank you.
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