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Persamaan :
y -y₁ = x -x₁
y₂ -y₁ x₂ -x₁
y -1 = x -2
-7 -1 -2 -2
y -1 = x -2
-8 -4
-4(y -1) = -8(x -2)
-4y +4 = -8x +16
-4y = -8x +16 -4
-4y = -8x +12
8x -4y -12 = 0
Itu jawabannya.