Write a system of equations to describe the situation below, solve using substitution, and fill
in the blanks.
Natalie and Perry are making presentations for a class project. Natalie's slideshow starts with
a verbal introduction that is 20 seconds long, and then each slide is left up for 6 seconds.
Perry leaves each slide onscreen for 11 seconds, and his introduction lasts 15 seconds.
Natalie and Perry notice that their presentations have both the same number of slides and
the same duration. How long is each presentation? How many slides are in each
presentation?
Each presentation is
seconds long and has
slides.