Results 1 to 3 of 3

Math Help - Co-ords intersection

  1. #1
    Member
    Joined
    Dec 2007
    Posts
    80

    Co-ords intersection

    How do i find the co ordiantes of the points of intersection of the circle x^2+y^2=25 and the line y=3x, and leave this in surd form. Thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Bar0n janvdl's Avatar
    Joined
    Apr 2007
    From
    Meh
    Posts
    1,630
    Thanks
    6
    Quote Originally Posted by Chez_ View Post
    How do i find the co ordiantes of the points of intersection of the circle x^2+y^2=25 and the line y=3x, and leave this in surd form. Thanks
    x^2 + y^2 = 25

    y = 3x

    x^2 + (3x)^2 = 25

    x^2 + 9x^2 = 25

    10x^2 = 25

    x^2 = 2,5

    x = \pm \sqrt{2,5}

    Set those values into the original equation to find the corresponding y-values.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    GAMMA Mathematics
    colby2152's Avatar
    Joined
    Nov 2007
    From
    Alexandria, VA
    Posts
    1,172
    Awards
    1
    Quote Originally Posted by Chez_ View Post
    How do i find the co ordiantes of the points of intersection of the circle x^2+y^2=25 and the line y=3x, and leave this in surd form. Thanks
    In general, to find an intersection of two functions (the circle really isn't a function, but we make it into one), you set them equal to each other.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 7
    Last Post: April 10th 2011, 03:51 AM
  2. Double integrals with polar co-ords
    Posted in the Calculus Forum
    Replies: 6
    Last Post: April 10th 2011, 01:53 AM
  3. Replies: 8
    Last Post: May 6th 2009, 12:21 PM
  4. Finding the co-ords where y = 0..
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: May 5th 2009, 06:32 AM
  5. Vector Calculus in Spherical Polar Co-ords.
    Posted in the Calculus Forum
    Replies: 1
    Last Post: November 26th 2008, 09:18 AM

Search Tags


/mathhelpforum @mathhelpforum