Mellissa plotted the graph of a function. The function contains the points and . The domain of the function is all whole numbers. Mr. Wilson reviewed her work and said that the graph is incorrect. Explain why this graph is incorrect.

Draw a correct graph.

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.