Jawabanmu

2013-12-05T19:19:40+07:00
* untk pers. 1 => 1/5 (x - 2) = 1/4 (1 + y)
                          1/5x -2/5 = 1/4 + 1/4y
                           1/5x - 1/4y = 1/4 + 2/5
                          1/5x - 1/4y = 13/20 ... (3)
* pers. 2 => 26x - 3y + 4 = 0
                  26x - 3y = -4 ... (4)
* pers. 3 dan 4 => 1/5x - 1/4y = 13/20  (di kali dgn 3)
                            26x - 3y = -4          (di kali dgn 1/4)
3/5x - 3/4y = 39/20
26/4x - 3/4y = -1    -
-118/20x = 59/20
           x = -59/118