Functions and Graphs
Range and domain

Functions and Graphs

• Direct proportion
• Inverse proportion
• Rational Functions
• Testing if a relationship is a function
• Checking if an equation represents a function
• Function notation
• Composite functions
• Range and domain
• Sign diagrams​

The domain of a relation is the set of values which the variable on the horizontal axis can take. This variable is usually x.
The range of a relation is the set of values which the variable on the vertical axis can take. This variable is usually y.