Turn on thread page Beta

A2 Core 4 Question - Vectors - Need Help watch

    • Thread Starter

    Hi There, I'm really stuck on this question and would appreciate some help (It's probably just me being stupid but I just can't do it)

    The question is from the AQA Pure Core 3 and 4 Book by Heinemann:

    Exercise 9C - Pg 325: It's in Vectors but as I can't write them, I'll put them in co-ordinate form.

    Question 5

    The line l1 has equation r = (2,0,-1) + s(3,4,5)

    (a) Find the acute angle between the line l1 and l2 with equation r = (5,-2,8) + t(3,-1,2).

    (b) The line l3 passes through the points A(3,-2,4) and B(5,1,7). Show that the lines l1 and l2 intersect and find the coordinates of their point of intersection.
    Original Question (I presume it's ok to post this as it's from Google Books, but I may be wrong):

    I've done the first part ok so far, but I can't seem to do part (b). Can anybody help me? Would be appreciated!

    If they intersect they'll have one point in common (say (x,y,z)). Can you solve for this consistently?

    (Original post by hct1802)

    You need to find the equation of l3.
    • Thread Starter

    Yeah thanks everyone. I've managed to do it after finding out l3
Submit reply
Turn on thread page Beta
Updated: February 5, 2010

University open days

  • University of East Anglia
    All Departments Open 13:00-17:00. Find out more about our diverse range of subject areas and career progression in the Arts & Humanities, Social Sciences, Medicine & Health Sciences, and the Sciences. Postgraduate
    Wed, 30 Jan '19
  • Aston University
    Postgraduate Open Day Postgraduate
    Wed, 30 Jan '19
  • Solent University
    Careers in maritime Undergraduate
    Sat, 2 Feb '19
Brexit: Given the chance now, would you vote leave or remain?
Useful resources

Make your revision easier


Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here


How to use LaTex

Writing equations the easy way


Best calculators for A level Maths

Tips on which model to get

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

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

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