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Math Help - Help please!!!

  1. #1
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    Help please!!!

    i need to solve for x
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  2. #2
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    Quote Originally Posted by jobu View Post
    i need to solve for x
    sketch a third line parallel to the other two through the vertex of angle x.

    x = 80 degrees ... do you see why?
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  3. #3
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    im not sure why?????
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  4. #4
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    note that by drawing the third parallel line, angle x is cut into two smaller angles.

    one of the smaller angles forms an alternate-interior pair with the 50 degree angle, the other forms an alternate-interior pair with the 30 degree angle.

    the two angles (50+30) sum to be the value of x.
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