# Any math/science buffs around?

Discussion in 'The Guru's Pub' started by dune2, Jul 14, 2005.

1. ### dune2Ancient Guru

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I have a small question,

when I want to show mathematically that independent variable Y is negatively related to X, how do I show this? Is there is certain sign I can use?
The sentence is: Y decreases if X is increased. Anybody good at statistics??

Cheers for any help!

2. ### smnoamlsMaha Guru

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how about Y= 1 / x ?
or Y = - X?

3. ### dune2Ancient Guru

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I guess mathematically, the first one is actually correct. But I was hoping more for a statistical way of writing down a correlation. Thanks anyway!

4. ### Mohsin AliMember Guru

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The correct equation is [ y = - x ].

You can easily imagine it graphically, for every increasing value of x, y decreases, and a simple straightline graph is formed. If you keep the slope to 1 then you get [ y= - x] but still you can switch between slopes and starting point , in this equation the line passes through origin because there isn't horizontal shift present in the equation.

, here is the graph

Last edited: Jul 14, 2005

5. ### VinnieAncient Guru

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Havnt got that on school yet... I think

6. ### fa7alActive Member

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There is a greek sign for proportional to, its kind of like a lower cased alpha except with a tail on the top on the right. In other words, an infinite sign with the circle on the right half cut off.

So to write it you would just write y (proportional sign thingy) -x

7. ### ShadowsoldierAncient Guru

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I love math

Its fun to be a nerd

8. ### dune2Ancient Guru

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@fa7al: Any chance you have a pic of that sign?

9. ### PcKSnipEMaster Guru

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Note sure about the latter

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11. ### FreeFallMaster Guru

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Thanks for the link drwngflies.

12. ### drwngfliesMaha Guru

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Wish I would've stayed in class more and learnt these things... %)

13. ### reflexAncient Guru

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i havnt got to this kinda math in school yet

14. ### DojomannAncient Guru

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Wow, what grade are you in? I started fully using variables in grade 9.

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