Results 1 to 3 of 3

Math Help - Equations of Lines

  1. #1
    Newbie
    Joined
    Oct 2011
    Posts
    3

    Equations of Lines

    I solved the answers for the following. Although, I do not know exactly how to grasp the concept of the x-intercept? I don't know what x-intercept is.

    The equation 6x+8y+9=0 has the x-intercept of ___ and the y-intercept of ___. It defines the straight line of ___.

    My answers are:

    x-intercept =
    y-intercept = -9/8
    Straight Line of Slope = -3/4.

    The equation 4.5x+7.3y+2.1=0 has the x-intercept of ___ and the y-intercept of ___. It defines the straight line of ___.

    My answers are:

    x-intercept =
    y-intercept = -21/73
    The Slope is = -45/73

    The equation -5.2x+7.4y-5.6=0 has the x-intercept of ___ and the y-intercept of ___. It defines the straight line of ___.

    My answers are:

    x-intercept =
    y-intercept = 28/37
    The Slope is = 26/37
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    10,964
    Thanks
    1008

    Re: Equations of Lines

    Why haven't you found the x intercepts? Do you know that x-intercepts occur when y = 0?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member mathbyte's Avatar
    Joined
    Oct 2011
    Posts
    26

    Post Re: Equations of Lines

    Prove It is correct. The x-intercept is simply where y=0.

    Or, think of it this way... the x-intercept is where that line passes through (or intercepts) the x-axis. At that point, y must be zero.

    The y-intercept works pretty much the same way. It's the point where the line passes through (or intercepts) the y-axis. And at that point, x must be zero.

    Finding either intercept then just becomes a matter of knowing what is zero and setting that value to zero in the equation.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. equations of lines
    Posted in the Algebra Forum
    Replies: 24
    Last Post: September 16th 2011, 12:02 PM
  2. Help with equations of lines.
    Posted in the Algebra Forum
    Replies: 11
    Last Post: March 13th 2011, 05:09 PM
  3. I need help /w equations of some lines
    Posted in the Calculus Forum
    Replies: 3
    Last Post: August 2nd 2008, 11:31 AM
  4. Equations of Lines
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: March 17th 2008, 06:20 PM
  5. Equations of Lines
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: May 3rd 2007, 08:58 PM

Search Tags


/mathhelpforum @mathhelpforum