September 2018 2 81 Report
Jika himpunan sistem persamaan \left \{ {{x-y=1} \atop { x^{2} -xy+y^{2} =7 }} \right. \\ adalah {(x1,y1), (x2,y2)}. maka hanya y1+y2 adalah

Tlong dijawab yaa..Yg Bisa. Mksh:)
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