1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Directly proportional?

  1. Dec 14, 2004 #1
    directly proportional? can anyone give an example of it?


    thanks alot!
     
  2. jcsd
  3. Dec 14, 2004 #2

    Pyrrhus

    User Avatar
    Homework Helper

    y and x are directly proportional, A is a constant.

    [tex] y = Ax [/tex]

    [tex] \frac{y}{x} = A [/tex]
     
  4. Dec 14, 2004 #3
    Right. This is represented as [tex]y\propto x[/tex].
     
  5. Dec 14, 2004 #4
    thanks! :smile:
     
  6. Dec 14, 2004 #5
    Careful. Make sure A is not a positive constant < 1. Otherwise you will get that they are inversely proportional.
     
  7. Dec 14, 2004 #6

    hi cyby! what you mean with that? do you mean that A must always be a positve number if not it will be inversely proportional? :cry:
     
  8. Dec 14, 2004 #7

    Tom Mattson

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    No, that's not true. It's still a direct proportion. y and x are inversely proportional if y=A/x.
     
  9. Dec 14, 2004 #8
    Uh, you are right. Sorry, was thinking about something else completely.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Directly proportional?
Loading...