Results 1 to 3 of 3

Math Help - How to find y-intercept and asymptote of an exponential function

  1. #1
    Newbie
    Joined
    Sep 2005
    Posts
    16

    How to find y-intercept and asymptote of an exponential function

    If my exponential function is:

    y=5(2/3)^x +1, my graphing calculator shows that its asymptote is y=1 ans its y-intercept is 11.

    However, I thought that when you substituted x for 0 (because x=0 at the y-intercept) that you would get the y-intercept from the equation. Well, in doing so, I obtain 6 as my y-intercept.

    Anyoe know what's going on?

    Thanks in advance to anyone who reads this/answers this/even attempts to answer this.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Global Moderator

    Joined
    Nov 2005
    From
    New York City
    Posts
    10,616
    Thanks
    9
    What you said about y-intercepts and horizontal asymptotes is correct. Look.
    Attached Thumbnails Attached Thumbnails How to find y-intercept and asymptote of an exponential function-picture9.gif  
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member

    Joined
    May 2006
    From
    Lexington, MA (USA)
    Posts
    11,740
    Thanks
    645
    Hello, Danielle!

    If my exponential function is: y\:=\:5\left(\frac{2}{3}\right)^x +1,
    my graphing calculator shows that its y-intercept is 11.

    Just a guess . . .

    I bet you forgot the parentheses around the \frac{2}{3}

    . . and you entered: .  5\;\boxed{\times}\;2\;\boxed{\div}\;3\;\boxed{\wed  ge}\;0\;\boxed{+}\;1

    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: November 5th 2011, 11:30 PM
  2. Replies: 7
    Last Post: March 16th 2010, 08:22 PM
  3. Replies: 2
    Last Post: September 30th 2009, 04:29 AM
  4. Replies: 1
    Last Post: September 25th 2009, 02:46 AM
  5. Replies: 2
    Last Post: March 26th 2009, 08:27 PM

Search Tags


/mathhelpforum @mathhelpforum