Answers

2014-10-15T23:47:33+08:00
Using elimination method:
x - 2y = 7  ----equation 1
3x + 2y = 16 ---equation 2
add equations 1 and 2
     x - 2y = 7
+ 3x + 2y = 16
   4x + 0y = 23
   4x = 23
     x = 23/4

multiplying equation 1 by 3 you'll have:
(x - 2y = 7) x 3  => 3x - 6y = 21  ----equation 3
subtract equation 3 from equation 2
   3x + 2y = 16
-  3x - 6y = 21
          8y = -5
            y = -5/8
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