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y =
2x+y=8 --> 2x+(x+1)=8
--> 3x=8-1
--> 3x=7
--> x=
kita masukkan nilai x ke persamaan untuk mencari y:
y=x+1 --> y=
--> y=1
coba kita buktikan...
2x+y=8 --> 2(
-->
-->
-->8=8
Benar!!!