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Which graphs represent a proportional relationship? Select all that apply. On a coordinate plane, a straight line goes through (0, 0), (1, 2), and (2, 4). On a coordinate plane, a curved line starts at the origin. On a coordinate plane, a straight line goes through (1, 3) and (3, 4). On a coordinate plane, a straight line goes through (0, 0), (4, 1), and (8, 2).