
Applied Math Applied Math Forum 
 LinkBack  Thread Tools  Display Modes 
September 10th, 2012, 09:31 PM  #1 
Senior Member Joined: Apr 2010 Posts: 128 Thanks: 0  Scalar vectors : need help in proving
In my exercise book got this question under topic Vectors Geometry >Scalar vectors i have absolutely no idea how to do it. I even doubt the validity of this question. All I can imagine is that there are 3 lines flying around without directions(i imagined in 2d) 
September 10th, 2012, 09:50 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: Scalar vectors : need help in proving
We may give the coordinates of A as: , B as and C as . These points are collinear if the slope from A to B is equal to that from B to C: Hence, the three points are collinear. 
September 13th, 2012, 09:23 PM  #3 
Senior Member Joined: Apr 2010 Posts: 128 Thanks: 0  Re: Scalar vectors : need help in proving
it took me days.....finally sort out.... therefore they are collinear....... but how come i don't understand your equation, mark? i mean , how you get the 4 '=' sign line up to each other and say it is collinear..... 
September 13th, 2012, 09:26 PM  #4 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: Scalar vectors : need help in proving
If the slope between the first point to the second point is the same as the slope from the second point to the third point, then we know the three points are collinear.

September 14th, 2012, 07:25 AM  #5  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Re: Scalar vectors : need help in proving Hello, rnck! I'll explain what MarkFL did . . . Quote:  

Tags 
proving, scalar, vectors 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Problem with proving ,vectors + trigo + bearing  rnck  Trigonometry  31  September 20th, 2012 12:51 AM 
3dimensional scalar field  arron1990  Calculus  4  August 2nd, 2012 08:29 AM 
Scalar IVP existenceuniqueness for x(t)?  lu5t  Abstract Algebra  0  March 4th, 2011 08:16 AM 
Differentiating Vectors and Gradient of a Scalar Field?  cypher  Linear Algebra  3  June 29th, 2010 01:40 PM 
Problem with proving ,vectors + trigo + bearing  rnck  Linear Algebra  1  December 31st, 1969 04:00 PM 