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Assume two lines do not coincide (~q). Then, either their slopes are different or their y-intercepts are different (~p). Since ~q → ~p is true, p → q must be true. Therefore, if the slopes and y-intercepts
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Assume two lines do not coincide (~q). Then, either their slopes are different or their y-intercepts are different (~p). Since ~q → ~p is true, p → q must be true. Therefore, if the slopes and y-intercepts are the same, then two lines coincide.

User Aravind A
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I wish i could help but dont know the answer. I reccomend using mathpapa the website to help with math problems of all types
User Chrisvj
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User Grind
asked Nov 22, 2017 96.5k views
Explain how to use the slopes and y-intercepts to determine if two lines coincide or are parallel.
Grind asked Nov 22, 2017
by Grind
10.0k points
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1 vote
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