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persamaan garis :
y - y1 = m (x - x1)
y - 4 = (x - 6) ....kedua ruas kalikan dengan 3
3y - 12 = - 2 (x - 6)
3y - 12 = - 2x + 12
2x + 3y - 12 - 12 = 0
2x + 3y - 24 = 0