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July 19th, 2012, 06:54 AM  #1 
Newbie Joined: Jul 2012 Posts: 7 Thanks: 0  Two Linear Equations http://tinypic.com/view.php?pic=35lw7xv&s=6 someone can please show me how solve this kind exercises

July 19th, 2012, 07:12 AM  #2 
Global Moderator Joined: Nov 2009 From: Northwest Arkansas Posts: 2,766 Thanks: 4  Re: Two Linear Equations
It must have taken longer to take and upload that image than merely typing out the equations would have. I'm mobile, or I might just do it myself. Anywho. 0) google any of the following that you don't understand 1) Write each equation in standard form Ax + By = C 2) use the method of elimination ("systems of equations") 
July 20th, 2012, 03:28 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 18,954 Thanks: 1601 
Doubling the first equation then subtracting the second gives 10x + 8  (12x  7) = 18x + 4y + 12  (7x + 4y  9), i.e., 22x + 15 = 25x + 21, so x = (21  15)/3 = 2. Replacing x with 2 in either of the given equations leads to y = 3. 

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equations, linear 
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