In this introductory activity, students will choose one of three scenarios that describe a linear relationship. These scenarios are based on the following professions: business owner, construction worker, and veterinarian. The prompts in this activity lead students to create a table and a graph to visualize their scenario, discuss independent and dependent variables as inputs and outputs, and consider whether or not a function can have two outputs for a single input. The final page has students create their own scenario with given requirements.