Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta

Help with coordinate geometry question (CORE 1) ? watch

    • Thread Starter
    Offline

    12
    ReputationRep:
    Hi I'm stuck on this question and I don't understand why I am not getting the answer on the mark scheme please help.

    Question: A is the point (-2,6), and B is the point (3,-8). The line L is perpendicular to the line x-3y+15=0 and passes through the midpoint of AB. Find the equation of L, giving your answer in the form ax+by+c=0, where ABC are integers

    Anyway this is my answer : -3x - y + 1/2 = 0

    The mark scheme says the answer is .6x + 2y - 1 = 0

    Upon typing this question I realised it said INTEGARS so if I multiply my answer by 2 I get
    -6x -2y + 1 = 0

    Is that right or is it still wrong please help me, Thank YOU
    Offline

    2
    ReputationRep:
    Yeah that's right. Because if you divide your answer by minus 1 then you get the answer on the mark scheme

    Posted from TSR Mobile
    Offline

    21
    ReputationRep:
    (Original post by Clovers)
    Yeah that's right. Because if you divide your answer by minus 1 then you get the answer on the mark scheme

    Posted from TSR Mobile
    Or alternatively if you add everything onto the other side
    Offline

    2
    ReputationRep:
    (Original post by Cinna21)
    Hi I'm stuck on this question and I don't understand why I am not getting the answer on the mark scheme please help.

    Question: A is the point (-2,6), and B is the point (3,-8). The line L is perpendicular to the line x-3y+15=0 and passes through the midpoint of AB. Find the equation of L, giving your answer in the form ax+by+c=0, where ABC are integers

    Anyway this is my answer : -3x - y + 1/2 = 0

    The mark scheme says the answer is .6x + 2y - 1 = 0

    Upon typing this question I realised it said INTEGARS so if I multiply my answer by 2 I get
    -6x -2y + 1 = 0

    Is that right or is it still wrong please help me, Thank YOU
    ops didn't read the whole post
    • Thread Starter
    Offline

    12
    ReputationRep:
    (Original post by MathsAndCompSci)
    No it's not. Is   \frac {1}{2} a integer fam?
    I know I already realised that read everything I wrote please, Thank You
    • Thread Starter
    Offline

    12
    ReputationRep:
    (Original post by jamestg)
    Or alternatively if you add everything onto the other side
    So its definitely right ?? Thanks for your help :P
    • Thread Starter
    Offline

    12
    ReputationRep:
    (Original post by Clovers)
    Yeah that's right. Because if you divide your answer by minus 1 then you get the answer on the mark scheme

    Posted from TSR Mobile

    So its right then ? Phewy Thanks
    Offline

    16
    ReputationRep:
    When you get to y= -3x + 1/2 , you need to get rid of the fraction first by multiplying the whole equation by 2, before you put the equation into the form ax+by+c=0
    • Thread Starter
    Offline

    12
    ReputationRep:
    (Original post by jessyjellytot14)
    When you get to y= -3x + 1/2 , you need to get rid of the fraction first by multiplying the whole equation by 2, before you put the equation into the form ax+by+c=0
    I will remember that thanks
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: January 18, 2016
Poll
Do I go to The Streets tomorrow night?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

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