Chris and Sam biked from Childress to Navalo, a distance of 82 miles. Chris's average speed was 13 mi/h, and Sam's average speed was 10 mi/h. (Let d denote distance and h denote time.) (a) Chris and Sam begin at the same time. On the same coordinate system, draw distance-time graphs showing Chris's and Sam's trips from Childress to Navalo. d 30 80 Sam 60 60 Chris Chris Sam 40 20 20 h h O 2 4 6 8 10 O 2 4 6 8 10 d 80 30 Chris 60 50 Sam Sam 40 Chris 10 20 20 - h th O 2 4 6 8 10 8 10 (b) Write equations for each of the bikers. Chris Sam (c) What is the slope of each line? Chris Sam