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[2] x + 2y = 0 -------------> x = -2y
⇔ x² + 4y² = 32
⇔ (-2y)² + 4y² = 32
⇔ 8y² = 32
⇔ y² = 4
⇔ y = ± 2
saat y = 2 ---------> x = -2(2) = -4
saat y = -2 --------> x = -2(-2) = 4
sehingga HP-nya adalah {(x,y)} = {(2,-4) atau (-2,4)}.