if the sides of a triangle are produced in order, prove that the sum of the exterior angles so formed is equal to four right angles​

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.

Graph the system of equations. {6x−4y=−244x−8y=−32 use the line tool to graph the lines.

Given abc find the values of x and y. in your final answer, include all of your calculations.