The domain of the following relation: r: {(−4, 8), (8, 10), (5, 4), (1, 6), (5, −9)} is (1 point)

]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