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3x +4 = 2y
2y = 3x +4
y = 3/2x +4/2
y = 3/2x +2
maka, m₁ = 3/2
m₁ . m₂ = -1
3/2 . m₂ = -1
m₂ = -1 per 3/2
m₂ = -2/3
y -y₁ = m(x -x₁)
y -(-2) = -2/3(x -5)
y +2 = -2/3x +10/3 dikali 3 untuk menghilangan penyebut, sehinggga
3y +6 = -2x +10
3y = -2x +10 -6
3y = -2x +4
2z +3y -4 = 0