Functions and Graphs
Sign diagrams

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​

Graphs of functions can be time consuming to create, especially if we only wish to know when the function is positive, negative, zero or undefined. A sign diagram is a time-efficient way to do this.