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సమాంతర మరియు లంబ రేఖల సమీకరణాలు
Translated from original video
Title - Equations of Parallel and Perpendicular Lines
URL -http://www.khanacademy.org/math/algebra/linear-equations-and-inequalitie/more-analytic-geometry/v/equations-of-parallel-and-perpendicular-lines