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