ada yang tau jawabannya??!!

3x - 2y = 6   | x2
2x + 3y = 6  | x 3
----------------------------
6x - 4y = 12
6x + 9y = 18
------------------ (-)
-13y = - 6
y = 6/13

a = 13y
a = 13 x 6/13
a = 6