
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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January 30th, 2018, 04:33 AM  #1 
Newbie Joined: Dec 2014 From: UK Posts: 11 Thanks: 0  Vector Triangle
Hi all Can someone explain the answer to the attached problem please? Regards Jim 
January 30th, 2018, 04:38 AM  #2 
Senior Member Joined: Oct 2009 Posts: 863 Thanks: 328 
Take $A$ to be the origin. Can you express B and C in terms of a and b? Can you then express M and N in terms of a and b? 
January 30th, 2018, 04:54 AM  #3 
Newbie Joined: Dec 2014 From: UK Posts: 11 Thanks: 0 
I do apologise but you have lost me. Can you be a bit more detailed in your questions please? I do want to worked it out for myself and do appreciate you are trying to point me in the right direction!

January 30th, 2018, 08:25 AM  #4 
Senior Member Joined: Oct 2009 Posts: 863 Thanks: 328 
If AC = 2a, then what is AM? What is the equation of points on the line BC in terms of AC and AB? 
February 3rd, 2018, 10:47 PM  #5 
Newbie Joined: Dec 2014 From: UK Posts: 11 Thanks: 0 
AM = a 3b2a Is that correct? 
February 4th, 2018, 07:59 AM  #6 
Global Moderator Joined: Dec 2006 Posts: 20,969 Thanks: 2218 
$\vec{CB} = \vec{AB}  \vec{AC} = 3\textbf{b}  2\textbf{a}$ Express $\vec{CN}$ as a fraction of $\vec{CB}$. $\vec{MN} = \vec{MC} + \vec{CN} = \textbf{a } +$ . . . 

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