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-x + 2y =9
---------------(+)
4x = 30
x = 30/4
x = 7,5
5x + 2y = 21
5 (7,5) + 2y = 21
37,5 + 2y = 21
2y = 21 - 37,5
2y = -16,5
y = -8,25
-x + 2y = 9 | dikali 5 (diambil dari 5x)
jadi
-5x + 2y = -21
-5x + 10y = 45
------------- -
. -8y = -24
y = (-24) : (-8)
y =3