Directly proportional?

  • Thread starter sotellme
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  • #1
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directly proportional? can anyone give an example of it?


thanks alot!
 

Answers and Replies

  • #2
Pyrrhus
Homework Helper
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y and x are directly proportional, A is a constant.

[tex] y = Ax [/tex]

[tex] \frac{y}{x} = A [/tex]
 
  • #3
574
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Right. This is represented as [tex]y\propto x[/tex].
 
  • #4
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thanks! :smile:
 
  • #5
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Careful. Make sure A is not a positive constant < 1. Otherwise you will get that they are inversely proportional.
 
  • #6
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cyby said:
Careful. Make sure A is not a positive constant < 1. Otherwise you will get that they are inversely proportional.

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:
 
  • #7
Tom Mattson
Staff Emeritus
Science Advisor
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cyby said:
Careful. Make sure A is not a positive constant < 1. Otherwise you will get that they are inversely proportional.
No, that's not true. It's still a direct proportion. y and x are inversely proportional if y=A/x.
 
  • #8
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Uh, you are right. Sorry, was thinking about something else completely.
 

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