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6. Determine whether the relation R on the set of all real numbers is reflexive, symmetric, antisymmetric, and/or transitive, where (x, y) = R if and only if b) x = ±y. a) x + y = 0. c) x - y is a rational number. d) x = 2y. f) xy = 0. e) xy ≥ 0. g) x = 1.