Piece-wise Function

Enter the first "piece" of the function as Y1 in parentheses along with
its restriction in a separate set of parentheses. Enter the second
"piece" of the function similarly as Y2. Enter any subsequent "pieces"
of the function as Y3, Y4, and so on.

Consider the following piece-wise function:

Enter the function as shown below:

The graphing mode should be changed from CONNECTED (default)
mode to DOT mode using the FORMAT menu. To view the FORMAT
menu, press [2ndF] [ZOOM]. Choose option E STYLE1, 2 DOT to
select the DOT graphing mode as shown below:

To view the graph of the function, press [GRAPH].