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m = -16x^-2 = -16/x² pada x = 3
m = -16/3² = -16/9
x = 3 ⇒ y = 16/x + 5 ⇔ y = 16/3 + 15/3 = 31/3 jadi titiknya (3 , 31/3)
Persamaan grs singgung
y - yi = m(x - x1)
y - 31/3 = -16/9(x - 3)
y = -16x/9 + 48 - 31/3
y = -16x/9 + 113/3 atau
9y = -16x + 339