Learning Diagnostic Analytics Recommendations Skill plans Math GA Standards on Awards Eighth grade > CC.9 Solve a system of equations using substitution: word problems 9M8 Tutorial @ Questions answered Write a system of equations to describe the situation below, solve using substitution, and fill in the blanks. 6 Roger and Dana are making presentations for a class project. Roger's slideshow starts with a verbal introduction that is 9 seconds long, and then each slide is left up for 7 seconds. Dana Time elapsed leaves each slide onscreen for 4 seconds, and her introduction lasts 21 seconds. Roger and Dana notice that their presentations have both the same number of slides and the same 00 29 08 duration. How long is each presentation? How many slides are in each presentation? HR MIN SEC SmartScore Each presentation is seconds long and has slides. out of 100 7 Submit 48 Work it out C Oil @ $ % 8 W A 6 e t y u O p g h K b n m alt