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Old 15th September 2012, 09:57 AM   #1 (permalink)
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Sec 3 A Maths Questions

Please help with Q1(A) & Q1(C)



Thanks,
CHeers.

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Old 15th September 2012, 01:35 PM   #2 (permalink)
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Re: Sec 3 A Maths Questions

Originally Posted by k1ndan39 View Post
Please help with Q1(A) & Q1(C)



Thanks,
CHeers.
1a.
y=x/(px+q)
=1/p - (q/p)/(px+q)

Plot a graph of 1/(px+q) and y.
Gradient:-q/p
Y intercept: 1/p

1c.
e^y=px²-qx
=p(x²-(q/p)x)
=p(x-(q/2p))²-p(q/2p)²

Plot a graph of (x-(q/2p))² and e^y

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Old 16th September 2012, 01:41 AM   #3 (permalink)
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Re: Sec 3 A Maths Questions

For (c) you should plot (e^y)/x against x instead.

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Old 16th September 2012, 02:51 AM   #4 (permalink)
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Re: Sec 3 A Maths Questions

wa, used to be good and love math alot.

but now forgot all alr lol

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Old 16th September 2012, 08:47 AM   #5 (permalink)
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Originally Posted by JiaJian View Post
For (c) you should plot (e^y)/x against x instead.
For linearisation, there is always more than one answer. But yes your answer is much easier.

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Old 16th September 2012, 09:48 AM   #6 (permalink)
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Re: Sec 3 A Maths Questions

But I don't think Jiajian is right...

His Y is (e^y)/x
which consists of both y and x...

Yes, you do get a straight line graph but I feel that Y should only consists of y.

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Old 16th September 2012, 10:49 AM   #7 (permalink)
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Re: Sec 3 A Maths Questions

Originally Posted by Tetrahedron View Post
For linearisation, there is always more than one answer. But yes your answer is much easier.

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tetra, how long you take to finish your Emath/ amath papers at O levels

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Old 16th September 2012, 11:08 AM   #8 (permalink)
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Originally Posted by .Memo View Post
But I don't think Jiajian is right...

His Y is (e^y)/x
which consists of both y and x...

Yes, you do get a straight line graph but I feel that Y should only consists of y.
Not really, there's no rules stating that.. In physics H2 I'm sure u sometimes do plot graphs during SPA, in which the Y axis do not only consist y.

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Old 16th September 2012, 03:04 PM   #9 (permalink)
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Originally Posted by EightyOne View Post
tetra, how long you take to finish your Emath/ amath papers at O levels
Usually about 30minutes remaining?

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Old 16th September 2012, 03:33 PM   #10 (permalink)
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Re: Sec 3 A Maths Questions

Originally Posted by Tetrahedron View Post
Usually about 30minutes remaining?

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Oh. So you are the slow and steady type not the chiongsters 40 minutes finish and sleep type.. haha

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Old 16th September 2012, 03:48 PM   #11 (permalink)
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Re: Sec 3 A Maths Questions

Originally Posted by EightyOne View Post
Oh. So you are the slow and steady type not the chiongsters 40 minutes finish and sleep type.. haha
Yeap.

Became the chiongster only in JC.

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Old 16th September 2012, 06:31 PM   #12 (permalink)
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Re: Sec 3 A Maths Questions

Originally Posted by Tetrahedron View Post
For linearisation, there is always more than one answer. But yes your answer is much easier.

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The question is bad to begin with.

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