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m = y'(x)
y' = 2x - 5
m = 2(2) - 5
= 4 - 5
= -1
persamaan garisnya adalaj :
y - b = m(x - a)
y - 1 = -1(x - 2)
y - 1 = -x + 2
y = -x + 3
Jadi, persamaan garis singgungnya adalah y = -x + 3