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subtitusikan persamaan diatas ke X2+ y2 = 30
sehingga persamaan nya menjadi (10 - y)^2 + y2 = 30
100 - 2y - y^2 + y^2 = 30
100 - 2y = 30
70 = 2y
y = 35
dengan begitu x = 10-35 = -25