Example 2

" y is seven times the size of x" is an example of a written description of a function. Represent this function using a mapping diagram, a table of values, an equation, and a graph for the x-values −3, −2, −1, 0, 1, 2, 3.









              
       
 

Notice in Example 2 that the written description, mapping diagram, table of values, graph, and equation are simply different ways of representing the same information. The different representations serve different purposes. For example, an equation is used to algebraically manipulate, while a graph allows you to easily visualize the relationship between the variables.


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