My Math Forum Analytic Geometry

 Geometry Geometry Math Forum

 August 3rd, 2018, 11:43 AM #1 Newbie   Joined: Aug 2018 From: Turkey Posts: 1 Thanks: 0 Analytic Geometry Points A(2,-a), B(-a,2) and C(2,3) are in the same straight line. What values can a be? (Sorry for bad English translation.) Last edited by skipjack; August 3rd, 2018 at 06:25 PM. Reason: to replace "2.3" with "2,3".
 August 3rd, 2018, 11:51 AM #2 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1039 Are you familiar with straight line equation? https://www.mathsisfun.com/algebra/l...n-2points.html
August 3rd, 2018, 02:07 PM   #3
Math Team

Joined: Oct 2011

Posts: 14,597
Thanks: 1039

Quote:
 Originally Posted by avcimertb Points A(2,-a), B(-a,2) and C(2,3) are in the same straight line.
Do you mean C(2,3)?
If so, then line AC is vertical, to right of y-axis.
So B can't be on AC.
Are you sure you posted correctly?

Note: I may have missed something....

Last edited by skipjack; August 3rd, 2018 at 06:25 PM.

 August 3rd, 2018, 06:35 PM #4 Global Moderator   Joined: Dec 2006 Posts: 21,026 Thanks: 2257 The problem doesn't require that the points are distinct, so a = -2 or -3. Thanks from topsquark
August 3rd, 2018, 07:09 PM   #5
Math Team

Joined: May 2013
From: The Astral plane

Posts: 2,302
Thanks: 960

Math Focus: Wibbly wobbly timey-wimey stuff.
Quote:
 Originally Posted by skipjack The problem doesn't require that the points are distinct, so a = -2 or -3.
I agree that's the only way out but that makes it a bad problem, IMHO. (As if I'm humble. )

-Dan

August 4th, 2018, 09:52 PM   #6
Senior Member

Joined: Feb 2016
From: Australia

Posts: 1,838
Thanks: 653

Math Focus: Yet to find out.
Quote:
 Originally Posted by topsquark (As if I'm humble. ) -Dan
Or... as if you're Honest

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post tkttan Geometry 6 June 14th, 2014 07:03 AM Geometry 1 December 15th, 2012 08:36 AM Rayne Geometry 0 November 2nd, 2010 05:57 AM nortpron Geometry 12 April 6th, 2010 10:12 AM amkroes Geometry 12 November 7th, 2009 03:53 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top