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12 cards from this deck
Equal slopes (m1=m2m_1 = m_2m1=m2)
Right angles (90°)
m1×m2=−1m_1 \times m_2 = -1m1×m2=−1
m2=−1m1m_2 = -\frac{1}{m_1}m2=−m11
−ab-\frac{a}{b}−ba
Find slope of given line, use same slope
Find slope, then calculate negative reciprocal
y−y1=m(x−x1)y - y_1 = m(x - x_1)y−y1=m(x−x1)
−ba-\frac{b}{a}−ab
Multiply slopes; product should equal −1-1−1
Never meet
Negative reciprocals of each other
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