Will give brainliest answer which relation is a function? a {(2, 3), (1, 5), (2, 7)} b {(-1, 5), (-2, 6), (-3, 7)} c {(11, 9), (11, 5), (9, 3)} d {(3, 8), (0, 8), (3, -2)}

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.