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2x + 3y =20 x3 -->> 6x + 9y = 60
3x + 5y = 15 x2 -->> 6x + 10y = 30
______________-
-y = 30
y = -30
nilai x
2x + 3y = 20
2x + 3.(-30) = 20
2x + (-90) = 20
2x = 20+90
2x = 110
x = 55
x +2y = 55 + 2(-30)
= 55 + (-60)
= -15