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Persamaan :
y -y₁ = x -x₁
y₂ -y₁ x₂ -x₁
y -1 = x -2
6 -1 3 -2
y -1 = x -1
5 1
1(y -1) = 5(x -1)
y -1 = 5x -5
y = 5x -5 +1
y = 5x -4
5x -y -4 = 0
Itu jawabannya.