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Math Help - Parallel lines and proofs

  1. #1
    Junior Member
    Joined
    Sep 2008
    Posts
    71

    Parallel lines and proofs

    Can anyone tell me how to find the value of x in this picture? http://img3.imageshack.us/img3/1103/40973099.jpg

    I would also like some help in writing two-column proofs since I don't understand it at all... I would like some help with this problem http://img18.imageshack.us/img18/8045/98089481.jpg
    I'm supposed to prove J is parallel to K

    This is what I got for my columns
    L ll n | given
    Angle 12 is congruent to angle 8 | given

    I just basically know how to write the given

    If anyone helps me much appreciated!
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  2. #2
    Member
    Joined
    May 2009
    From
    New Delhi
    Posts
    153

    if lines L || M
    angle mbp =angle lcp = 19x
    and
    angle mbp + angle nbp = 180

    therefore ,19x+17x=180
    x=5
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