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Dengan,
m = gradien
y = 1/4x -3
Maka, m₁ = 1/4
m₁ . m₂ = -1
1/4 . m₂ = -1
m₂ = -1 per 1/4
m₂ = -4
y -y₁ = m(x -x)
y -5 = -4(x -(-1))
y -5 = -4x -4
y = -4x -4 +5
y = -4x +1
4x +y -1 = 0
Itu jawabannya.