Jawabanmu

2014-08-23T21:19:20+07:00
2x + 2y = 12
2x  -   y = 1
---------------------   - (dikurangi)
       3y  =11
         y  =11/3

kemudian, disubtitusikan=
2x - y = 1
2x - (11/3) = 1
2x = 1 + 11/3
2x = 14/3
x = (14/3) :2
x = 14/6

jadi, nilai y=11/3 dan nilai x=14/6
2014-08-23T21:19:21+07:00
Persamaan 1 - persamaan 2

Didapat 3y = 11, jadi y = 11/3
y disubstitusi ke persamaan 2, didapat x = 7/3

(x,y) = (7/3 , 11/3)