# Logarithms question? OCR MEI C2

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#1
I was wondering how you did question 6 from the june 2012 MEI OCR c2 paper?

I got to the gradient part (3), but didn't really know what to do from there...

I checked the mark scheme, but I don't really udnerstand it...

Thank you

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7 years ago
#2
(Original post by ThatWasHard!)
I was wondering how you did question 6 from the june 2012 MEI OCR c2 paper?

I got to the gradient part (3), but didn't really know what to do from there...

I checked the mark scheme, but I don't really udnerstand it...

Thank you

OK, so you found the gradient of this line. That is, you found that , for some . Can you find now?

EDIT: Not sure where you got 3 from, actually - how did you find that value? (It's not right.)
DOUBLE EDIT: Ignore me, I'm a fool.
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#3
(Original post by Smaug123)
OK, so you found the gradient of this line. That is, you found that , for some . Can you find now?

EDIT: Not sure where you got 3 from, actually - how did you find that value? (It's not right.)
DOUBLE EDIT: Ignore me, I'm a fool.
So here's where i'm stuck... Do I use (1,5) to give me:
log(10)(5) = 3log(10)(1)+c?
0
7 years ago
#4
(Original post by ThatWasHard!)
So here's where i'm stuck... Do I use (1,5) to give me:
log(10)(5) = 3log(10)(1)+c?
Yes. But now you have to make y the subject.
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#5
(Original post by brianeverit)
Yes. But now you have to make y the subject.
But sure 3log(10)(1) = 0, as log(10)(1) = 0

How do you make y the subject in this case?
0
7 years ago
#6
(Original post by ThatWasHard!)
But sure 3log(10)(1) = 0, as log(10)(1) = 0

How do you make y the subject in this case?
You have found c. Put it back in your equation and get rid of the logs.
0
7 years ago
#7
(Original post by ThatWasHard!)
But sure 3log(10)(1) = 0, as log(10)(1) = 0

How do you make y the subject in this case?
Combine the two logarithmic terms using the usual laws of logarithms. Then when you have something like convert to exponential form, i.e.
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