Answers

2014-01-19T21:03:22+08:00
(1) x-3y=3
(2) x+y=7

multiplying (2) by -1,
-x-y= -7

combining (1) and (2)
 x - 3y = 3
-x - y = -7
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-4y = -4
y = 1 

substituting y value to (1)
x - 3(1) = 3
x-3 = 3
x= 6

The answer is
x = 6
y = 1

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