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Maka, m₁ = 1/2
m₁ . m₂ = -1
1/2 . m₂ = -1
m₂ = -1 per 1/2
m₂ = -2
y -y₁ = m(x -x₁)
y -6 = -2(x -4)
y -6 = -2x +8
y = -2x +8 +6
y = -2x +14
2x +y -14 = 0
Itu jawabannya.