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#1 Re: Help Me ! » polar points in rectanglular coordinates » 2006-03-11 12:53:58
Thank you Mikau,
Your post was incrdibly helpful! I understand it all now 
thank you for doing the diagrams also.
Kind Regards
Lakitu
#2 Help Me ! » polar points in rectanglular coordinates » 2006-03-11 12:10:27
- lakitu
- Replies: 3
My teacher has told me I will need to be able to do these in my up and comping exam later this month. He covered the topic a while ago but I didn't quite understand. Here is an example I have.
Express the polar point (6, 120 °) in rectangular coordinates.
I have no idea how to start doing these? Guidence of any kind would be wonderful.
Regards Lakitu
#3 Re: Help Me ! » parametric equations as a cartesian equation help » 2006-03-08 05:29:32
thank you to both of you ! big help i understand it all
regards
lakitu
#4 Re: Help Me ! » parametric equations as a cartesian equation help » 2006-03-08 03:48:52
hi again, i have re written my question in a better way, sorry for the confusion.
i have figured out how to do a simple parametric - cartesian equation in the form of x and y here is what i have already done.
x = 2 t - 2 -----------------(1)
y = 3 t - 2 -----------------(2)
multiply (1) by 3 and (2) by 2.
3x = 6 t - 6 -----------------(3)
2y = 6 t - 4 -----------------(4)
eliminate t from the two eqns by subtracting (4) from (3)
3x - 2y = -6 + 4
3x - 2y = -2
in my exam i am assured i will need to know harder ones like this, but i cannot figure out how to do these.
Express the parametric equations x = t + 1 and y = -3 t² + 3 t as a Cartesian equation in just x and y.
i also need to simpify this in the form y = a x² + b x + c.
Any help would be great.
kind regards lakitu
#5 Help Me ! » parametric equations as a cartesian equation help » 2006-03-08 03:15:54
- lakitu
- Replies: 8
hi apologise if this is in the wrong forum
my lecturer has told me that i need to be able to express parametric equations as a cartesian equation and then Simplify it into the form y = a x² + b x + c in my exam later this month. my mind boggles !
here is an example i have found.
Express the parametric equations x = t + 1 and y = -3 t² + 3 t as a Cartesian equation in just x and y.
any help would be great!
kind regards lakitu
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