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Verified answer
Jawaby = 2x - x^(1/2)
y' = m = 2 - 1/2 x^(-1/2) = 2 - 1/(2√x)
untuk x = 9
m = 2 - 1/(2√9)
m = 2 - 1/6
m = 11/6
y - 16 = 11/6 (x - 9)
6(y -16) = 11(x - 9)
6y - 96 = 11x - 99
11x - 6y - 3 = 0