Which equation represents a proportional relationship? A. y=-2
B. y = 2x
C. y = 2
D. y=2/3
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]supplementary angles are two angles that add up to . • complementary angles are two angles that add up to degrees. • adjacent angles share a and a • congruent angles have the measure. • an triangle has one angle that is greater than 90 degrees. • a triangle with angles 45°, 45°, and 90° would be a triangle