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On the grid below, Beatrice draws all the lines with integer \(y\)-intercepts and slope 1 or -1. The lines form many intersection points. How many of these intersection points lie in the interior of the shaded region?

 



 

I need help getting started.Any solutions?

 Dec 15, 2021
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There will be six intersection points, one for each square.

 Dec 15, 2021

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