Use the point in the graph to find the equation of the line in point-slope form.
a) y + 20 = 2(x + 80)
b) y + 20 = 1/2(x + 80)
c) y − 20 = 2(x − 80)
d) y − 20 = 1/2(x − 80)

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.