How to determine the domain and range from the graphs of different functions

The video tutorial explains the concept of functions, emphasizing the importance of understanding domain and range. It introduces the vertical line test as a method to determine if a graph represents a function. The tutorial provides examples to illustrate how to identify functions and non-functions, and how to determine the domain and range of a function.

Describe how to determine the domain of a function from a graph.

What is the significance of the maximum point in determining the range of a function?

Why is the function not valid when there are multiple Y values for a single X value?