So many parallel and perpendicular lines all over the place, and none of them have been labeled. Which begs the question: whose lines are they, anyway?

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Parallel Lines and Transversals 
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Proving Lines are Perpendicular 
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Proving Lines are Parallel 
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Lines, Segments and Rays 
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SlopeIntercept Form 
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Linear Equations in Standard Form 
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Linear Equations 
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Intercepts