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Math Help - Can't find circumcentre of this triangle - stuck at system of equations

  1. #1
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    Can't find circumcentre of this triangle - stuck at system of equations

    I have a triangle with the following vertices:

    A (-25,20)
    B (-5,-40)
    C (15,30)

    The equation of the perpendicular bisector of AB which passes through D is y=3x + 35

    The equation of the perpendicular bisector of CB which passes through E is y=-2x/7 - 25/7

    I've tried the substitution method but keep getting X = -270/23 and Y = -5/23

    I'm sure these coordinates are wrong because I've got the circumcentre drawn already and it says it is (2.31,-4.23)

    Any help would be appreciated
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  2. #2
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    Re: Can't find circumcentre of this triangle - stuck at system of equations

    Quote Originally Posted by grogmachine View Post
    I have a triangle with the following vertices:

    A (-25,20)
    B (-5,-40)
    C (15,30)

    The equation of the perpendicular bisector of AB which passes through D is y=3x + 35
    no ... it's y = \frac{1}{3}x - 5

    recommend you check it all again ...
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