Results 1 to 8 of 8

Math Help - altitude equation

  1. #1
    Senior Member euclid2's Avatar
    Joined
    May 2008
    From
    Ottawa, Canada
    Posts
    400
    Awards
    1

    altitude equation

    Given the vertices of a triangle P(3,7), Q(-8,2), R(-4,-9) determine the equation of altitude that passes through the point P.
    The slope of P is 4/11, is what I have
    Please help
    Last edited by euclid2; July 10th 2008 at 11:06 PM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member nikhil's Avatar
    Joined
    Jun 2008
    Posts
    292
    Slope of point P is 4/11.
    Points do not have slopes.
    Is it slope of altitude?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member euclid2's Avatar
    Joined
    May 2008
    From
    Ottawa, Canada
    Posts
    400
    Awards
    1
    The slope of the line passing through the point is 4/11.
    I first calculated the slope of QR, which was -11/4, and p is a perpendicular bisector of that line so it is the negative reciprocal 4/11 which is passing through the point P.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Senior Member nikhil's Avatar
    Joined
    Jun 2008
    Posts
    292
    Ok so what i have understood is that slope of line(altitude) passing throug P whose equation is to be written is 4/11. Did you mean the same?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Senior Member euclid2's Avatar
    Joined
    May 2008
    From
    Ottawa, Canada
    Posts
    400
    Awards
    1
    My understanding is that the slope passing through p is 4/11, yes.
    The equation of a line im y=mx+b
    If you plug in the co-ordinates for P you will get this
    7=4/11(3)+b
    i am unable to figure it out from here
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Senior Member nikhil's Avatar
    Joined
    Jun 2008
    Posts
    292
    Quote Originally Posted by euclid2 View Post
    My understanding is that the slope passing through p is 4/11, yes.
    The equation of a line im y=mx+b
    If you plug in the co-ordinates for P you will get this
    7=4/11(3)+b
    i am unable to figure it out from here
    See Equation of any line can be written as y=mx+b.
    One should know the value of m and b.you have calculated m=4/11.but still don't know b.
    By 7=4/11(3)+b we can get value of b that is
    b=7-12/11
    now put the value of m and b in y=mx+b and you will get the desired equation.now any problem?Feel free to ask.
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Senior Member euclid2's Avatar
    Joined
    May 2008
    From
    Ottawa, Canada
    Posts
    400
    Awards
    1
    Ok but now we must make a final product
    y=4/11+7-12/11
    Is that how the final product is or do we have to simplify 7-12/11 before putting it into the final product, if so how?

    Thanks
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Senior Member nikhil's Avatar
    Joined
    Jun 2008
    Posts
    292
    Quote Originally Posted by euclid2 View Post
    Ok but now we must make a final product
    y=4/11+7-12/11
    Is that how the final product is or do we have to simplify 7-12/11 before putting it into the final product, if so how?

    Thanks
    No. The final product is
    y=4/11 (x)+7-12/11
    don't forget 1)x and 2)completing calculation of
    7-12/11.
    May be you should think about the concepts like how an equation can represent a line,what parameters are needee and why.this will make your understanding very clear.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Altitude
    Posted in the Geometry Forum
    Replies: 6
    Last Post: February 21st 2010, 05:10 AM
  2. Finding Altitude
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: February 15th 2010, 06:46 PM
  3. physics: model rocket altitude equation
    Posted in the Math Topics Forum
    Replies: 6
    Last Post: September 1st 2009, 06:25 PM
  4. Given the altitude:
    Posted in the Geometry Forum
    Replies: 1
    Last Post: May 20th 2009, 02:00 AM
  5. Altitude Length
    Posted in the Geometry Forum
    Replies: 5
    Last Post: March 15th 2007, 01:50 PM

Search Tags


/mathhelpforum @mathhelpforum