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y' = 2x + 3
m = y:(1) = 2.(1) + 3
= 2 + 3
= 5
persamaan garis singgung
y - b = m (x - a)
y - 3 = 5 (x - 1)
y - 3 = 5x - 5
y - 5x - 3 + 5 = 0
y - 5x + 2 = 0 atau 5x - y - 2 = 0