Results 1 to 3 of 3
Like Tree1Thanks
  • 1 Post By skeeter

Math Help - perpendicular line equation

  1. #1
    Junior Member
    Joined
    Mar 2012
    From
    San Francisco
    Posts
    32

    perpendicular line equation

    Find a number 't' such that the line in the xy-plane containing the points (-7,t) and (20,7) is perpendicular to the line y = -5x + 999

    We're solving for 't'

    Thank you.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,605
    Thanks
    1574
    Awards
    1

    Re: perpendicular line equation

    Quote Originally Posted by jonathanraxa View Post
    Find a number 't' such that the line in the xy-plane containing the points (-7,t) and (20,7) is perpendicular to the line y = -5x + 999
    Solve \left(\frac{-7-20}{t-7}\right)=-5 for t.
    Last edited by Plato; May 8th 2012 at 05:10 PM.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    11,621
    Thanks
    426

    Re: perpendicular line equation

    Quote Originally Posted by jonathanraxa View Post
    Find a number 't' such that the line in the xy-plane containing the points (-7,t) and (20,7) is perpendicular to the line y = -5x + 999

    We're solving for 't'
    perpendicular slopes are opposite reciprocals ...

    \frac{7-t}{20-(-7)} = \frac{1}{5}
    Thanks from jonathanraxa
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 4
    Last Post: May 12th 2011, 12:18 PM
  2. Perpendicular line equation!
    Posted in the Pre-Calculus Forum
    Replies: 6
    Last Post: December 14th 2009, 04:15 AM
  3. Replies: 11
    Last Post: June 2nd 2009, 06:08 PM
  4. Replies: 1
    Last Post: October 23rd 2008, 03:39 AM
  5. equation of a line perpendicular to the line defined
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: June 6th 2007, 09:02 AM

Search Tags


/mathhelpforum @mathhelpforum