Given the table, write an expression for the function, and describe what it does. a) y=2x. y is double x. b) y=3x. y is triple x. c) y=4x. y is 4 times x. d) y=2x+1. y is twice x plus 1.

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.