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# C4 Parametric cartesian equation help needed!

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1. First one I'm stuck on...

1) x = 4t + 3 , y= 16t(t+1)

Find a cartesian equation

for my answer I got (x - 3)(x - 2) actual answer is (x - 3)(x + 1)

2) x= t + 1/t^3 , y= t^3 + 1/t^3

answer is x^3= y + 3x

Find a cartesian equation.
2. (Original post by AndyOC)
First one I'm stuck on...

1) x = 4t + 3 , y= 16t(t+1)

Find a cartesian equation

for my answer I got (x - 3)(x - 2) actual answer is (x - 3)(x + 1)

2) x= t + 1/t^3 , y= t^3 + 1/t^3

answer is x^3= y + 3x

Find a cartesian equation.
t=(1/4)(x-3)

Sub that in to the y equation
3. (Original post by Shumaya)
t=(1/4)(x-3)

Sub that in to the y equation
yeah i see what I've done now just an algebra mistake, thank you! could you help with the second one please?
4. (Original post by AndyOC)
yeah i see what I've done now just an algebra mistake, thank you! could you help with the second one please?
I'm working on it
5. (Original post by Shumaya)
I'm working on it
Any luck with that question?
6. (Original post by AndyOC)
Any luck with that question?
Nope haha. Just hoping that the parametric equations in the exam are nicer!
7. If you can't do it tonight I'll do it tomorrow morning for you :P
8. (Original post by Shumaya)
Nope haha. Just hoping that the parametric equations in the exam are nicer!
Yeah hope so!
9. (Original post by nobodycarescarla)
If you can't do it tonight I'll do it tomorrow morning for you :P
If you could that would be great
10. (Original post by AndyOC)
If you could that would be great
Hey can you double check for me
2) x= t + 1/t^3 , y= t^3 + 1/t^3 that this is the right question? I cant understand how they got the answer, it doesnt seem right
11. (Original post by nobodycarescarla)
Hey can you double check for me
2) x= t + 1/t^3 , y= t^3 + 1/t^3 that this is the right question? I cant understand how they got the answer, it doesnt seem right
12. (Original post by nobodycarescarla)
Hey can you double check for me
2) x= t + 1/t^3 , y= t^3 + 1/t^3 that this is the right question? I cant understand how they got the answer, it doesnt seem right
Attached Images

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14. (Original post by AndyOC)
Ah thankyou! I mis understood what you ment :')
15. (Original post by nobodycarescarla)
Ah thankyou! I mis understood what you ment :'
Brilliant thank you!

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