Which correctly describes the behavior of the graph of y=5 in the xy-plane?
a. the graph is a horizontal line
b. the graph is falling as x increases
c. the graph is rising as x increases
d. the graph is a vertical line

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.