This Problem Set is a part of the Lesson 3, Unit 6, Grade 8. A plumbing company charges a service fee of $120, plus $40 for each hour worked. Sketch the graph of the linear function relating the cost to the customer (in dollars), to the time worked by the plumber (in hours) on the axes. If the plumber works for 0 hours, what is the cost to the customer? How is this shown on the graph?