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2x+y=11
X-2y=-2
________-
X+3y=13
X+3y=13
= X=13-3y
Setelah itu jadikan subtitusi dengan X-2y=-2
1(13-3y)-2y=-2
-5y=-15
Y =3
Untuk mencari x masukan y=3 ke 2x+y=11
2x +1(3)=11
2x=11-3
2x=8
X=4
x=4, y=3