# Linear Functions

Linear Functions are most basic functions in mathematics. They are simple to formulate and evaluate mathematically. Linear functions have many applications in calculus in general, and in business, economics, psychology, etc. in particular.

**Learning Objectives**

- Domain and range
- Interpretation of slope as average rate of change
- Intercepts and graph
- Finding equation of line using slope and intercept
- Finding equation of a line using two points in the plane
- Properties of parallel and perpendicular lines
- Finding equations of parallel and perpendicular lines
- Modeling with linear with functions