Please provide a succinct explanation below (graphs and calculations may be necessary): The set ECR consisting of: {(x, y): x + y = 1) The set EC R² consisting of {(x,y): x + y< 1) Closed Set? Open Set? Bounded Set? Convex Set? Concave Set? Upper-Level Sets Convex Set?

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A: It can be solved by the set theory

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