Last week, Ann bought 9 shirts and 6 hats for a total of $126. Today, Ann bought 6 shirts and 5 hats for a total of $87.
Assuming neither item has changed in price,
what is the cost of a shirt in dollars?

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.