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x+y=8. dikali 2
jadi,
x+2y=10
2x+2y=16
------------ dikurangi
-x=-6
x=6
di masukkan untuk mencari y:
x+2y=10
6+2y=10
2y=10-6
2y=4
y=2
jadi jawabannya adalah c. (6,2)