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# OCR (not MEI) C1 - Wednesday 13th May 2015 watch

1. (Original post by rich1334)
I put 6x-8y-29 I think
Yeh that was it ) I put that too
2. (Original post by micycle)
Were the simultaneous equations:

2x+y=5 AND x^2-y^2=3

OR

2x+y=5 AND x^2+y^2=3
first one!!!
3. (Original post by micycle)
Were the simultaneous equations:

2x+y=5 AND x^2-y^2=3

OR

2x+y=5 AND x^2+y^2=3
The first one
4. (Original post by User10102929)
Got -1/48 for this I think
Grrr

Anyone know how many marks this was out of?
5. Pretty sure it is this
Attached Images

6. (Original post by micycle)
Were the simultaneous equations:

2x+y=5 AND x^2-y^2=3

OR

2x+y=5 AND x^2+y^2=3
2x+y=5 AND x^2-y^2=3

Was an easy paper but subject to a fair few mistakes

My estimate is around 65/66, same as last year
I'd say the one last year was a lot easier. I'm hoping for 62/63.
8. (Original post by Brian luiz)
I got both of those answers, im sure they are right.
I got both of these too
9. can someone please do an unofficial mark scheme for this paper???/

and how is A=13????
10. (Original post by AstroNandos)
Grrr

Anyone know how many marks this was out of?

pretty sure it was 4
11. (Original post by Parallex)
was that find the gradient of when x=8?

I got -1/48 for that

Was it not -1/3?
12. So for part 2iii is stretch 1/3 parallel to y wrong??
13. (Original post by Parallex)
pretty sure it was 4
Oh. ****.
14. (Original post by lily9666768)
first one!!!
In which case, the simultaneous equation:

= 2 & 14/3
15. A will be 66
16. (Original post by Dentist214)
That gives me hope, would they need to be high A's in c2 and s1 like 65/72? Obviously depending on grade boundaries but never seen them higher than that
65/72 was unusually high for a core 1 exam. They're normally 61/62 and s1 and core 2 A marks are normally 56-59
17. (Original post by AstroNandos)
Was it not -1/3?

solution:

18. (Original post by AstroNandos)
Was it not -1/3?
Pretty surr i got-16/3 question was definitely x^-1/3

Edit: I was wrong, eugh I've dropped so many stupid marks
19. (Original post by Katie.R.S.)
So for part 2iii is stretch 1/3 parallel to y wrong??
Yes its stretch of scale factor 1/3 parallel to x axis
20. (Original post by AstroNandos)
Was it not -1/3?
Dy/dx = -1/3x^-4/3

Input 8:

-1/3 x 1/16 = -1/48.

Not sure if that's what I put in the exam but looking now it's quite straight forward..

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