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OpenStudy (anonymous):
Line j passes through the points (0, 0) and (c, d). Line k passes through the points (0,0) and (-d, c). Lines j and k are parallel perpendicular neither
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OpenStudy (anonymous):
perpendicular
OpenStudy (anonymous):
just find the slopes and use the formula, \[\tan \theta=|m_1-m_2|/(1+m_1m_2)\]
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