Grade 7 - Lesson 2: Equations for Proportional Relationships

Jorge works in a shoe store and earns a commission for every dollar's worth of shoes he sells. When he sells $150 worth of shoes, he earns $15 in commission. Which equation can be used to find the total commission, C, that Jorge will earn if he sells shoes with a total cost of s, in dollars?

A painter mixes 6 parts red paint and 8 parts yellow paint to make dark orange paint. Which equation can the painter use to calculate the amount of red paint, R, that is needed to mix with a given amount of yellow paint, Y?

A town library is raising money by selling old books for $2 each. Which equation can be used to find the amount of money raised if the number of books sold if x represents the number of books sold and y represents the number of dollars raised?

There are 64 crayons in a box. If c represents the total number of crayons in b boxes, which equation can be used to model the situation?