# parametric equation x=3t^2 and y=2t^3Watch

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#1
I do not understand what i have to do, i need to make y the subject but this is confusing.
The question is parametric equation x=3t2 and y=2t3
find the cartesian equation for the curve with these parametric equations.
0
6 years ago
#2
How about trying to rearrange the x equation to make t the subject, and then substitute that into your y equation?
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#3
Tried that but it does not look right, and I'm confused on how to simplify it
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6 years ago
#4
(Original post by HEY_101)
Tried that but it does not look right, and I'm confused on how to simplify it
How about you show us what you've got, and we'll say where/if you've gone wrong.
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#5
t=
then i put it into y
so 2()3
then im confused
0
6 years ago
#6
(Original post by HEY_101)
t=
then i put it into y
so 2()3
then im confused
ill give you a clue

whats root x cubed? and whats 3 cubed? try that
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#7
2(x2/3/32/3)
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6 years ago
#8
(Original post by HEY_101)
2(x2/3/32/3)
root x cubed is root x and 3 cubed is 27 so u have root x/ 27 in brackets and multiply by 2 and clean up the fraction.
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6 years ago
#9
(Original post by Benjy100)
OH HOW EMBARRASSING! THE SHAME, THE SHAME I SAY!

No but in all seriousness it looks neater in the form I wrote it in, as opposed to resorting to a plus-minus sign...
Sorry my mistake, I thought I read the question as "find a Cartesian equation in the form y=f(x)", so can actually keep it in that form
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6 years ago
#10
(Original post by Benjy100)
OH HOW EMBARRASSING! THE SHAME, THE SHAME I SAY!

No but in all seriousness it looks neater in the form I wrote it in, as opposed to resorting to a plus-minus sign...

EDIT - Yes you walk away old chap, this duel has been won by me - you fought bravely, but only one could be victorious
you dont have to write it as y= something it depends on the question but yes benji posted the right solution however in future please let the OP figure it out first
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6 years ago
#11
(Original post by Benjy100)
Ah then we shall shake hands cordially and our paths shall diverge - who knows when we shall meet again? ONLY TIME WILL TELL
what have you been smoking?
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#12
Thanks everyone for helping me see where i was going wrong
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6 years ago
#13
(Original post by ezioaudi77)
what have you been smoking?
hahahaha this is exactly what i was thinking
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