Ways to represent domain and range
There are 4 different ways to represent domain and range. These are ordered pairs, mapping diagram, table, and graph.
Important observations about the different ways to represent domain and range
 In a table, put the xvalues in increasing order or from least to greatest.
 In a mapping diagram, put both the xvalues and the yvalues in increasing order. Furthermore, do not repeat the number! For example, notice that 2 is listed as an output only once.
 When representing the domain and range as ordered pairs, there is no need to write the pairs in order.
 When writing the domain and the range, always list in numerical order.
 Finally, notice that we put the xvalues in the domain on the left of the table and also on the left of the mapping table.

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