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y² = x + 8y
kurangkan
x² - y² = 7x - 7y
(x+y)(x-y) = 7(x-y)
(x+y) = 7(x-y)/(x-y)
(x+y) = 7
x² = 8x + y
y² = x + 8y
jumlahkan
x² + y² = 9x + 9y
x² + y² = 9(x+y)
x² + y² = 9(7)
x² + y² = 63