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Big Ideas Math Integrated I, 2016 View details

3. Writing Equations of Parallel and Perpendicular Lines

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Exercise 33 Page 182

What is the product of the slopes of perpendicular lines?

Never

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If lines are perpendicular, the product of their slopes is always - 1. The slopes of perpendicular lines are negative reciprocals. Since the question states that both lines have positive slopes, the product of them can never equal anything other than a positive number. m_+ * m_+ = m_+ Therefore, the statement is never true.