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# Urgent maths help!

Maths and statistics discussion, revision, exam and homework help.

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1. Urgent maths help!
Hiya I urgently need help from anyone with this maths problem, I've done it but the answer doesnt look right to me...please help!

'y is directly proportional to x^2 and y=9 and x=6.
Express y in terms of x'
2. Re: Urgent maths help!
what have you done

what did you get
3. Re: Urgent maths help!
y = kx^2

9=k x 6^2

9=36k

9/36=k

0.25=k

y=0.25x^2
4. Re: Urgent maths help!
(Original post by ellie2996)
Hiya I urgently need help from anyone with this maths problem, I've done it but the answer doesnt look right to me...please help!

'y is directly proportional to x^2 and y=9 and x=6.
Express y in terms of x'

Use the information, y=9 and x=6, to find 'k'.
5. Re: Urgent maths help!
(Original post by ellie2996)
y = kx^2

9=k x 6^2

9=36k

9/36=k

0.25=k

y=0.25x^2
Its correct according to me.
6. Re: Urgent maths help!
(Original post by ellie2996)
y = kx^2

9=k x 6^2

9=36k

9/36=k

0.25=k

y=0.25x^2
That is correct
7. Re: Urgent maths help!
I got y=0.25x^2 but I don't know if that is correct
8. Re: Urgent maths help!
Okay thank you

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Last updated: May 3, 2012
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