Jawabanmu

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2014-09-12T20:36:10+07:00
3x + y = 4 
-x + 2y = 1    > x =-2y +1

3(-2y + 1) +y = 4
-6y + 3 + y = 4
-5y = 4 -3
-5y = 1
y= 1/-5

x= 2(1/-5) +1
  = 2/-5 + 1
 = -3/-5
= 3/5
2 5 2