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May 02, 2026, 08:57:50 pm
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Author Topic: find the cartesian eqn of...  (Read 1218 times)  Share 

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mano91

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find the cartesian eqn of...
« on: October 29, 2009, 11:40:44 am »
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x= t/(t^2 +1)

y=1/(t^2+1)

this is from mav 08. a little help please
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mano91

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Re: find the cartesian eqn of...
« Reply #1 on: October 29, 2009, 11:46:57 am »
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never mind. i figured it out :)
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Hooligan

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Re: find the cartesian eqn of...
« Reply #2 on: October 29, 2009, 01:11:47 pm »
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Is the answer ?
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humph

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Re: find the cartesian eqn of...
« Reply #3 on: October 29, 2009, 01:13:38 pm »
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You can't have the parametric variable in the cartesian equation, you have to express it in terms of and/or .
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Mxbn0

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Re: find the cartesian eqn of...
« Reply #4 on: October 29, 2009, 01:24:20 pm »
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good question eh?

for those who don't know, you have to let x= t*(1/t^2+1) and thus x= t*(y). then u can go from there :)

Answer: x^2 + ( y - 1/2 )^2 = ( 1/2 )^2
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NE2000

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Re: find the cartesian eqn of...
« Reply #5 on: October 29, 2009, 03:06:43 pm »
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Yeah I think I just said:



And then subbed that into the y-expression and just rearranged. Same result as Mxbn0
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Hooligan

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Re: find the cartesian eqn of...
« Reply #6 on: October 29, 2009, 03:13:58 pm »
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Quote from: humph on October 29, 2009, 01:13:38 pm
You can't have the parametric variable in the cartesian equation, you have to express it in terms of and/or .

LOL. *headdesk* that was stupid of me.  :buck2:

anyways... I can't get it now. I got the but then what do I do from there? sub it back into y and then re-arrange? I tried that ... but don't get 1/2 anywhere...  ???
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sachinmachin

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Re: find the cartesian eqn of...
« Reply #7 on: October 29, 2009, 03:15:36 pm »
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yeh this question had me stumped. didnt realise that t=x/y..
would have made things so much easier if id realised..
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GerrySly

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Re: find the cartesian eqn of...
« Reply #8 on: October 29, 2009, 03:26:58 pm »
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Quote from: Hooligan on October 29, 2009, 03:13:58 pm
anyways... I can't get it now. I got the but then what do I do from there? sub it back into y and then re-arrange? I tried that ... but don't get 1/2 anywhere...  ???
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Hooligan

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Re: find the cartesian eqn of...
« Reply #9 on: October 29, 2009, 03:33:17 pm »
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Quote from: GerrySly on October 29, 2009, 03:26:58 pm
Quote from: Hooligan on October 29, 2009, 03:13:58 pm
anyways... I can't get it now. I got the but then what do I do from there? sub it back into y and then re-arrange? I tried that ... but don't get 1/2 anywhere...  ???


whoa... that's crazy!! Would never thought of that. I got up the 6th line, and then I just got stuck. Thanks a bunch. :D
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