Functions and Graphs
Testing if a relationship is a function

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​

A function of x is for any one input of x, there is a maximum of one output for y.
If we have the graph of the relation, we can test to see if it is a function by performing a vertical line test.