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Verified answer
Substitusiy = y
9 - x² = x² + 1
x² + x² + 1 - 9 = 0
2x² - 8 = 0
2x² = 8
x² = 8/ 2
x² = 4
x = ± √4
x = ± 2
untuk x = 2
y = 9 - (2)² = 9 - 4 = 5
untuk x = -2
y = 9 - (-2)² = 9 - 4 = 5
maka HP (2, 5) dan (-2, 5)