If a line has slope −2/3, what is the slope of a perpendicular line? A 2/3 B −3/2 C 3/2 D −2/3 ✓ Correct Answer: Option C Perpendicular slopes are negative reciprocals: −(1/(−2/3)) = 3/2. Practice ACT Exam Prep Quizzes → Browse All Questions Study Flashcards