Algebra I: One to many relationship
 This is a free lesson from our course in Algebra I In this lesson, you'll learn how relations can have one to many mapping. You'll also learn how to determine whether two sets of points have one to one mapping or many to one. As you might already know, the points with same values of y for different values of x have many to one mapping. For example, {(0, 5), (1, 5), (2, 5), (3, 5), (4, 5)} has many to one mapping. However, if in a set of points each x has a unique y for it, then it's a case of one to one mapping. A function which may (but does not necessarily) associate a given member of the range of with more than one member of the domain. (More text below video...)
Other useful lessons:
 Types of functions Finding the domain of function Finding the domain and range of the functions Identify if the graph is a function or not Finding the domain and range of an equation Determine domain and range from a finite set of ordered pairs
(Continued from above) For example, trigonometric functions such as sin x are many-to-one since
sin x = sin(2p+x) = sin(4p+x).
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