Unit 3, Lesson 3

Representing Proportional Relationships

Grade 8

Practice

1. Problem 1

   Student Task Statement

   This graph describes the relationship between the volume of uncooked rice and the volume of the rice after it is cooked.

   

   graph, horizontal axis, x (cups of uncooked rice), scale 0 to 30, by 4's. vertical axis, y (cups of cooked rice), scale 0 to 60, by 10's. line passes through origin, 20 comma 60.

   1. Write an equation that reflects this relationship where  represents the volume in cups of uncooked rice and represents the volume in cups of the rice after it is cooked. 
   2. Complete the table: 

      cups of uncooked rice	cups of cooked rice
      20
      	120
      1