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= (b,2b + 2)
Titik dua
= (b - 3,3b)
Ingat :
m = (y₂ - y₁) / (x₂ - x₁)
1 = (3b - 2b - 2) / (b - 3 - b)
1 = (b - 2)/(-3)
1(-3) = b - 2
-3 = b - 2
b = -3 + 2
b = -1