# FP3 Vectors, cartesian planeWatch

Announcements
#1
The plane passes through the P, with position vector and is perpendicular to the line L with equation:

a) show the cartesian equation of is

Can anyone explain where the 5 comes from? chances are i'll get stuck on the rest of the question after this, but for now i just don't know where the 5 comes from.
0
11 years ago
#2
I think that's a typo. I remember changing one of my question papers last week when someone spotted a type and this seems to be it. The 2 should be a 5 in the original question I believe.
0
#3
(Original post by silent ninja)
I think that's a typo. I remember changing one of my question papers last week when someone spotted a type and this seems to be it. The 2 should be a 5 in the original question I believe.
Oh thank god, i thought that the 2 was probably a typo because it worked fine if i put 5 in. But since i lost my textbook i don't have anything to check my method against >.<

Thanks
0
#4
On the same question:

The plane contains the line L and passes through Q,

c)find the equation of in the form

i get a is and b is but the answer scheme says c is which i don't understand =/

0
11 years ago
#5
You have to find two non-parallel vectors from a starting point, in this case 3i-2k. So, we know a line which lies on the plane (line L) as spotted. Now the next step is to use the other piece of information given. We know that Q lies on the plane. So how can you link Q in to get the second vector?
0
#6
(Original post by Pixie-Goblin)
You have to find two non-parallel vectors from a starting point, in this case 3i-2k. So, we know a line which lies on the plane (line L) as spotted. Now the next step is to use the other piece of information given. We know that Q lies on the plane. So how can you link Q in to get the second vector?
Oh right, that's really easy thanks.

It would be just as valid to use wouldn't it? since the direction of the line doesn't matter, only that it's parallel.
0
11 years ago
#7
indeed, in that case the equivalent t value would just be a negative but it still works out no problem
0
#8
Great, thanks.
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

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

### University open days

• The University of Law
The Bar Series: Applications and Interviews - London Bloomsbury campus Postgraduate
Thu, 17 Oct '19
• Cardiff Metropolitan University
Sat, 19 Oct '19
• Coventry University
Sat, 19 Oct '19

### Poll

Join the discussion

#### Why wouldn't you turn to teachers if you were being bullied?

They might tell my parents (10)
6.41%
They might tell the bully (17)
10.9%
I don't think they'd understand (28)
17.95%
It might lead to more bullying (58)
37.18%
There's nothing they could do (43)
27.56%