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x= 5-y kan?oke lanjut
2x + y^2 = 4, maka
2(5-y) + (5-x)^2 = 4
10-2y + 25 - 10x + x^2 = 4
x^2 - 10x - 2y + 35 = 4 maka
x^2 - 10x -2y = -31
note: ^ adalah pangkat. koreksinya yaaa