Results 1 to 2 of 2

Math Help - Double check

  1. #1
    Junior Member
    Joined
    Sep 2008
    Posts
    71

    Double check

    I just need a double check with my problems about point slope the one with the forumula like y-y1=m(x-x1)

    (6,-4), (3,5) answer y=1x+8
    (2,7), (1,-4) answer y=11x-43
    (-5,13), (-10,9) I got -4/5x+1

    If I got all three of these correct then I know what I'm doing If I don't I might come back to ask for more help...
    Thanks for helping me!
    Last edited by Jubbly; December 3rd 2008 at 04:44 PM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Dec 2008
    From
    Auckland, New Zealand
    Posts
    189
    For coordinates: (6, -4) and (3, 5)

    gradient (m) = \frac{-4-5}{6-3} = \frac{-9}{3} = -3

    Substituting:

    y - 5 = -3 (x - 3)

    y = -3x + 14


    For coordinates: (2, 7) and (1, -4)

    gradient (m) = \frac{7 - -4}{2-1} = \frac{11}{1} = 11

    Substituting:

    y - 7 = 11 (x - 2)

    y = 11x - 15


    For coordinates: (-5, 13) and (-10, 9)

    gradient (m) = \frac{13 - 9}{-5 - -10} = \frac{4}{5}

    Substituting:

    y - 13 = \frac{4}{5} (x + 5)

    y = \frac{4}{5} x +17
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. can someone double check this for me?
    Posted in the Calculus Forum
    Replies: 6
    Last Post: July 18th 2010, 02:55 PM
  2. Double Check
    Posted in the Calculus Forum
    Replies: 5
    Last Post: November 15th 2009, 06:11 PM
  3. double check
    Posted in the Algebra Forum
    Replies: 1
    Last Post: October 21st 2008, 11:03 AM
  4. can someone please just double check
    Posted in the Calculus Forum
    Replies: 4
    Last Post: July 1st 2008, 10:54 PM
  5. Double check please
    Posted in the Calculus Forum
    Replies: 2
    Last Post: June 4th 2006, 08:09 PM

Search Tags


/mathhelpforum @mathhelpforum