September 4th, 2012, 03:39 AM  #1 
Senior Member Joined: Jul 2012 Posts: 225 Thanks: 0  Vectors in three dimensional space
Point A is on the straight line x=(1,1,0)+t(2,3,5) Point B is on the straight line x=(1,6,9)+s(1,2,4) Point C(2,3,6) is the middle of the vector AB. Find points A and B. Edit: in 2 dimensional space, if point B(Xb,Yb) is in the middle of the line AC A(Xa,Ya) C(Xc,Yc) then Xb=(Xa+Xc)/2 and Yb=(Ya+Yc)/2. Does that formula work in three dimensional space aswell? 
September 4th, 2012, 07:07 AM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,929 Thanks: 1124 Math Focus: Elementary mathematics and beyond  Re: Vectors in three dimensional space 
September 4th, 2012, 12:23 PM  #3 
Senior Member Joined: Jul 2012 Posts: 225 Thanks: 0  Re: Vectors in three dimensional space
Thank you greg, that was helpful.


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