Flashcard 6 - Math Flashcard Set for the ACT

*Parallel lines have the same slope and do not intersect:

\[m_1 = m_2\]

Perpendicular lines have negative reciprocal slopes and intersect at a single point, if:

\[m_1 = 3 \;and\; m_2 = \frac{-1}{3}\]

All other lines intersect at one point.