tolong jawablha soalnya penting

2/x + 3/y = 12 ---- x1 ---- 2/x + 3/y = 12
3/x - 1/y = 7 ---- x3 ---- 9/x - 3/y = 21
Ditambah
11/x = 33
x/11 = 1/33 ----x11
x = 1/3

3/x - 1/y = 7
3/(1/3) - 1/y = 7
9 - 1/y = 7
-1/y = -2
1/y = 2
y = 1/2

(x,y) = (1/3,1/2)