If two lines are perpendicular, which statement must be true? A.The slopes of the two lines are equal. B.The slopes of the two lines are undefined. C.The slopes of the two lines are zero. D.The slopes of the two lines are negative reciprocals.

Answer:Option D is correct that is The Slopes of two lines are negative reciprocals.Step-by-step explanation:Perpendicular lines are the lines which intersect each other at right angle or make 90° angle with each other.we that the Slope of perpendicular lines are equal to -1Therefore, Option D is correct that is The Slopes of two lines are negative reciprocals.