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 April 25th, 2014, 02:40 PM #1 Senior Member   Joined: Nov 2013 Posts: 434 Thanks: 8 fin 3x+5y+z=40 7x+12y+2z=92 find x+y+z
 April 25th, 2014, 02:58 PM #2 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,671 Thanks: 2651 Math Focus: Mainly analysis and algebra Write $u = x + y + z$ and $v = x + 2y$ and solve for $u$ and $v$
 April 25th, 2014, 03:27 PM #3 Global Moderator   Joined: Dec 2006 Posts: 20,809 Thanks: 2150 Subtracting twice the second equation from five times the first equation gives x + y + z = 200 - 184 = 16. Thanks from Olinguito

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