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  1. Parallel and Perpendicular Lines - Math is Fun

  2. Slope: Parallel & Perpendicular Lines - Purplemath

  3. Slopes of Parallel and Perpendicular Lines - ChiliMath

  4. Slope of Parallel - Definition, Formula, Derivation, Examples

  5. Slope of Parallel Line: Formula, Derivation, Example - SplashLearn

  6. Parallel Slopes and Perpendicular Slopes: Complete Guide

  7. Parallel and Perpendicular Lines: Identify them with Slopes

  8. 3.6: Parallel and Perpendicular Lines - Mathematics LibreTexts

  9. 13.2.3: Parallel and Perpendicular Lines - Mathematics LibreTexts

  10. Slopes of Parallel and Perpendicular Lines – Explanation