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 x-values in increasing order or from least to greatest.

• In a mapping diagram, put both the x-values and the y-values 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 x-values in the domain on the left of the table and also on the left of the mapping table.