You are Here: Home >< Maths

# M1 help on vectors question Watch

1. Really thought vector questions couldn't get harder than the previous ones I had done. I'm stuck on part a) i understand that the i component of the walker is 6i but I can't seem to work out the j component, also the direction of the walker to the mast is i + j. In the mark scheme I don't understand where 6j came from any help would be appreciated

EDIT:
I got the same answer by increasing i and j component by 1 until 6i was reached so i got

0i + 2j
1i + 3j
...
6i + 8j

Is it okay if i write it as 2j + n(i + j) = 6i + aj ? Is there a better way than this thank you
Attached Images

2. We know that the person is at (6,x) for some x, because he's on the pipeline. Also, the person sees something at (0, 2) as being southwest - that is, the mast is at (6,x) + (-y,-y) for some y, because something which is southwest of you is at (-1, -1)k for some k.
Hence (6,x)+(-y,-y)=(0,2) and so y = 6, x = 8. This tells us that the person is at (6,8) and that the vector from him to the mast is (-6,-6).
3. (Original post by Smaug123)
We know that the person is at (6,x) for some x, because he's on the pipeline. Also, the person sees something at (0, 2) as being southwest - that is, the mast is at (6,x) + (-y,-y) for some y, because something which is southwest of you is at (-1, -1)k for some k.
Hence (6,x)+(-y,-y)=(0,2) and so y = 6, x = 8. This tells us that the person is at (6,8) and that the vector from him to the mast is (-6,-6).
Is my method ok 2j + n(i + j) = 6i + Xj. Not sure if i can always do this
4. (Original post by .raiden.)
Is my method ok 2j + n(i + j) = 6i + Xj. Not sure if i can always do this
Yep, your method is pretty much exactly what mine is - I just expanded my explanation a bit (I find that narrative is easier to understand than raw equations). In this kind of question, you'll always be able to do this.
5. (Original post by Smaug123)
Yep, your method is pretty much exactly what mine is - I just expanded my explanation a bit (I find that narrative is easier to understand than raw equations). In this kind of question, you'll always be able to do this.
Thanks yes I see what you mean

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 9, 2013
Today on TSR

### Does race play a role in Oxbridge admissions?

Or does it play no part?

### The worst opinion about food you'll ever hear

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.