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October 21st, 2012, 11:32 AM  #1 
Newbie Joined: Oct 2012 Posts: 2 Thanks: 0  System of equations?
I hope this is the correct place to post this. I have 4 equations with 4 unknowns. Let's assume the lower case letters represent different numbers that are known constants. A = B/s B = C/t C = D/u A + B + C + D = 10 Can anyone give me some hints on how to solve this? Thanks! 
October 21st, 2012, 11:57 AM  #2  
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 12,438 Thanks: 832  Re: System of equations? Quote:
just get any 4 numbers that equal 10: as example, 1,2,3,4: A=1, B=2, C=3, D=4. A = B/s : s = B/A = 2/1 = 2 B = C/t : t = C/B = 3/2 C = D/u : u = D/C = 4/3  
October 21st, 2012, 12:44 PM  #3  
Global Moderator Joined: May 2007 Posts: 6,511 Thanks: 585  Re: System of equations? Quote:
B=C/t=D/(ut) A=B/s=D/(stu) D[1 + 1/u + 1/(ut) + 1/(stu)] = 10 I assume you can go from here.  
October 22nd, 2012, 12:16 AM  #4  
Newbie Joined: Oct 2012 Posts: 2 Thanks: 0  Re: System of equations? Quote:
 
October 22nd, 2012, 04:31 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 18,963 Thanks: 1606 
Any way that you've been taught (or can find) to solve simultaneous linear equations would have worked.


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