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28 February, 19:30

How can coordinate proof be used to prove two lines are parallel?

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  1. 28 February, 20:58
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    You can use the coordinates to find the slope of each line. If you can show the two slopes are equal, then the lines are parallel.

    Side note: If the lines are vertical, and never cross, then they will be parallel despite having an undefined slope. This is one of the exceptions to the rule.
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