This Instructional Activity is a part of the Lesson 24, Unit 4, Grade 8. Pia types at a constant rate of 3 pages every 15 minutes. Pia's rate is 1/5 pages per minute. If she types y pages in x minutes at that constant rate, then y = 1/5x. Pia's rate represents the proportional relationship y = 1/5x. The given table displays the number of pages Pia typed at the end of certain time intervals.