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3x-y+8=0 --> 3x-y=-8 (ii)
eliminasi (i) dan (ii)
x+2y=1 (dikali 1) --> x+2y=1
3x-y=-8 (dikali 2) --> 6x-2y=-16
keduanya dijumlahkan diperoleh 7x=-15, x = -15/7
x+2y=1
-15/7 + 2y =1
2y = 7/7 + 15/7
2y = 22/7
y = 11/7
Semoga membantu, terima kasih :)