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m = y' = 2x - 2
-3 = 2x - 2
2x = -1
x = -1/2
maka y = 1/4 + 1 + 6 = 29/4
Persamaan garis singgung:
y - 29/4 = -3(x + 1/2)
4y - 29 = -12x - 6
12x + 4y - 23 = 0