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f '(x)= -12
y=-3x-2 ⇒ m=-3
f '(x)=m
- =-3
x₁ = 2 x₂ = -2 y=y₁+m(x-x₁)
A= (2,6) ⇒ y=6+(-3)(x-2) → h: y=-3x+12
B=(-2,-6) ⇒ y=-6+(-3)(x+2) → i: y=-3x-12