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February 25th, 2010, 03:45 PM  #1 
Newbie Joined: Nov 2008 Posts: 3 Thanks: 0  Urgent help needed
Hi guys this is Dilshad again, algebra is getting tough day by day and I really don't know what's going on, we are learning to solve system of 3 linear equations. example, 8x5y+z=15 3x+yz=7 x+4y+z=3 and even these kind, xy =5 2yz=1 3x+3+z=6 Is there a easy way to solve these? since I always end up with wrong answer. There must be a quick and easy way to do this, since I'm doing this for weeks for 9 hours straight and I still don't get please help Dilshad. 
February 25th, 2010, 05:37 PM  #2  
Senior Member Joined: Mar 2007 Posts: 428 Thanks: 0  Re: Urgent help needed Quote:
Google is your friend. If you look for [solve three equations] you will come up with many sites such as this: http://www.sosmath.com/soe/SE3001/SE3001.html  
February 26th, 2010, 03:23 AM  #3  
Global Moderator Joined: Dec 2006 Posts: 19,505 Thanks: 1741  Quote:
If you take anough care to avoid careless slips, you should be able to use the elimination of variables method of solution to obtain correct answers.  
February 26th, 2010, 04:13 AM  #4  
Member Joined: Feb 2010 Posts: 51 Thanks: 0  Re: Urgent help needed Quote:
xy =5  (1) 2yz=1  (2) 3x+3+z=6 (3) (if the question you typed is correct) From (1), x = 5+y  (4) Sub. (4) into (3) 3 (5+y)+3+z=6 18+3y+z = 6  (5) (2)+(5) 2yz + (18+3y+z) = 1+6 5y+18 = 7 y = 11/5 Sub. y = 11/5 into (1) , find x Sub. y = 11/5 into (2), find z Hope that it helps. By the way, honestly, I haven't learned to solve system of 3 linear equations.  
February 26th, 2010, 03:03 PM  #5 
Newbie Joined: Nov 2008 Posts: 3 Thanks: 0  Re: Urgent help needed
Thanks all for the reply, the thing is, it's when I just normally try solving I just stop when I'm moving the variables example making positive 3's into negative 3's moving to the other side, then I stop totally since I don't see how I can go any further. The mind just goes blank at me.

February 26th, 2010, 03:37 PM  #6  
Senior Member Joined: Mar 2007 Posts: 428 Thanks: 0  Re: Urgent help needed Quote:
 

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