4) ABCD is a rectangle. A is the point ( 0 , 1 ) and C is the point ( 0 , 6 ). The equation of the straight line through A and B is y = 2x + 1 a) Find the equation of the straight line through D and C.

b) Find the equation of the straight line through B and C

5) The point P has coordinates (2,1) and the point Q has coordinates ( -2 , -1 ). Find the equation of the perpendicular bisector of PQ

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.