Results 1 to 4 of 4

Math Help - Tan and theta!

  1. #1
    Newbie
    Joined
    Aug 2008
    Posts
    7

    Tan and theta!

    Ok, so I have to calculate the angle the line y= 5x -7 makes with the X axis. I did m= tan theta, m= -5, which gave me a negative answer.

    Sooo... do I add on 180 degrees or do I need to do something else?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Newbie
    Joined
    Aug 2008
    Posts
    15
    for y = 5x -7 m will equal 5 not -5.

    -1/m will give u a tangent to the line out of interest
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Aug 2008
    Posts
    7
    sorry, y= -5x-7.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Aug 2008
    Posts
    15
    if u think about it a line with a gradient m will have the same angle between it and the x axis as -m but on left rather than right hand side of its intercept with the x axis. so it m = -5 will have the same acute angle as m = 5 with the x axis
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 0
    Last Post: April 29th 2010, 10:24 AM
  2. Replies: 2
    Last Post: March 29th 2010, 07:38 AM
  3. Replies: 3
    Last Post: February 6th 2009, 04:19 PM
  4. Replies: 1
    Last Post: January 23rd 2009, 10:53 AM
  5. Solve sin4(theta) = cos2(theta)
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: December 8th 2008, 11:23 AM

Search Tags


/mathhelpforum @mathhelpforum