## Finding Parallel and Perpendicular Lines

Perpendicular Lines A pair of lines is perpendicular if the lines meet at 90^\circ 90∘ angle. Given two non-vertical lines in slope-intercept form \begin {aligned} y &= m_1 x + b_1\\ y &= m_2 x + b_2, \end {aligned} y y = m1x +b1 = m2x +b2,

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