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wegnerkolmp2741o

parallel lines have the same slope

perpendicular lines have the negative reciprocal

ie 3--------> -1/3

gmany

The parallel lines have the same slope.

Let

[tex]k:y=m_1x+b_1,\ l:y=m_2x+b_2\\\\l\ ||\ k\iff m_1=m_2[/tex]

Perpendicular lines have the negative and reciprocal slopes.

[tex]l\ \perp\ k\iff m_1m_2=-1\to m_2=-\dfrac{1}{m_1}[/tex]

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