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2x + 3y = 16 x1
-----------------------------+
3x - 3y = 9
2x + 3y = 16
----------------------------+
5x = 16
x = 16/5
-y = 3-x
2x + 3(3 - x) = 16
2x + 9 - 3x = 16
2x - 3x =16 - 9
x =7
7 - y = 3
-y =3-7
y = -4
jadi, x= 7 dan y = -4