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-x^2-2xy+8y^2 = 0....2
tambahkan persamaan 1 dan persamaan 2
9y^2 = 9y^2 = 1y = 1
subtitusi dengan y =1
x^2 + 1+ 2x =9-x^2-2x+8=0
x^2+2x-8=0
(x-2)(x+4)=0
x=2 v x = -4
ambil x= positif,
sehingga didapatx = 2 dan y -1