My Math Forum Two Linear Equations

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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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