Practice problem
Suppose two perpendicular lines have slopes m1m_1m1 and m2m_2m2. What is the product m1∗m2m_1 * m_2m1∗m2 in terms of m1m_1m1?
m1m_1m1
−m1-m_1−m1
−1-1−1
−1m1\frac{-1}{m_1}m1−1
Type a concept, like “slope” or “photosynthesis”.