5. Identify the constant of proportionality from the table below. Constant of proportionality: 6. Identify the constant of proportionality from the graph below. Constant of proportionality: Learning Target 26​-I can create an equation to model a proportional relationship. 7. A student spends the same amount each week for bus fare. In 5 weeks, he spends $115. Write an equation to model this relationship. Use ​x​ to represent the number of weeks and ​y​ to represent the total cost. 8. Write an equation to model the proportional relationship from the graph. Time (h) 25 50 75 100 Earnings ($) 160 320 480 640