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

Original post by czj1997

Okay, can someone just clarify this:

stretch, scale factor 1/3 in the y-direction.

Wrong or right? There are so many different answers, i'm confused

A 1/3 stretch parallel to either the x or y axes is correct. So, yes, that is correct.

Reply 401

Numpers123

What do you think 68/72 is UMS??

Reply 402

Molly_xox

16

Original post by Klaxoii

I did, using pythag, but seems like we're wrong! Although we must have got the right co-ordinates so can't have lost too many marks

Yeah same here! And I thought it'd be strange to have a root as an answer in a C1, so I kept trying to check it but we must've just been barking up the wrong tree. Yeah, that's my logic - we can't have lost more than 2 of the marks because we had the right co-ords (I'm assuming a mark per co-ord?)

Reply 403

K-King121

1

Just out of interest on the 1/3 stretch parallel to either axes, would you have to state it could be to either axes, or just state any one?

Reply 404

mountaindewwwww

Original post by K-King121

It's correct, since you are multiplying the entire function by a scale factor of 1/3 it's correct.

That's wrong on so many levels, go back over your gcse work.

Reply 405

Numpers123

Original post by K-King121

Just out of interest on the 1/3 stretch parallel to either axes, would you have to state it could be to either axes, or just state any one?

Just 1

Reply 406

Madhutty

2

Original post by Numpers123

What do you think 68/72 is UMS??

For this paper I would guess at 90 +/- 2

Reply 407

Molly_xox

16

Original post by Octan

What grade do you guys think I'll be looking at if I lost 9 marks worst case scenario?

Okay, last year I lost 11 marks and got 73 UMS, so I'd say a B is your absolute worst case scenario. I'd be surprised if the grade boundaries were that high again though, so it's probably an A :smile:

Reply 408

K-King121

1

Original post by mountaindewwwww

That's wrong on so many levels, go back over your gcse work.

Are you actually stupid?

Reply 409

PlAtYpUsBoi97

7

Original post by Dentist214

Great, lost 5 marks!!!! I got 11, no wonder I couldn't get the stationary point, I've done so bad

All about the method marks dont worry!

Reply 410

MacDaddy101

just to clarify i had my teacher go over the question about the scale factor, and 1/3 in either direction is correct, just how the graph is

Reply 411

mountaindewwwww

Original post by K-King121

Are you actually stupid?

r u actually stood stoopd

Reply 412

Whittick

I'm not sure but I think I only got one pair of the simultaneous equations right (but I equally may have gotten it right, I really can't remember) and calculated the discriminant but didn't get the correct value for k. So at worse I probably lost 6 marks, as I got all other answers right, will this be an A and what kind of ums am I looking at?

Reply 413

Madhutty

2

Original post by MacDaddy101

just to clarify i had my teacher go over the question about the scale factor, and 1/3 in either direction is correct, just how the graph is

Your teacher is quite right!

Reply 414

K-King121

1

Original post by mountaindewwwww

r u actually stood stoopd

Lol, for any function: f(x) when stretching of a scale factor k, parallel to the y-axis, it becomes kf(x), i.e. multiplying the whole function!

Reply 415

Madhutty

2

Original post by Whittick

I'm not sure but I think I only got one pair of the simultaneous equations right (but I equally may have gotten it right, I really can't remember) and calculated the discriminant but didn't get the correct value for k. So at worse I probably lost 6 marks, as I got all other answers right, will this be an A and what kind of ums am I looking at?