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3x+y=4 ⇔(ditambah)
5x= 5
x = 5/5 =1
2x-y=1
2(1)-y = 1
2-y = 1
-y = 1-2
y = -1 +2
y = 1
3x+y =4
________ +
5x=5
x=1
3x+y=4
3.1+y = 4
y=4-3
y=1
jadi, x=1, y=1
(kalo gak salah gtu hehe)