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y' = 4 - 1/2√x
x = 4 → m = 4 - 1/2√4 = 4 - 1/4 = 15/4
Persamaan garis singgun
y - 14 = 15/4(x - 4)
4y - 56 = 15x - 60
15x - 4y - 4 = 0