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karena tegak lurus, m-nya dibalik jadi 4/3
y-y1 = m (x-x1)
y-5 = 4/3 (x+6)
3(y-5) = 4(x+6)
3y-15= 4x+24
3y-4x= 39 atau bisa juga 3y-4x-39 = 0