Appendix B - Graphing Utilities - B.1 The Viewing Rectangle - B.1 Assess Your Understanding - Page B2: 5

$X[-6,6,2]$ by $Y[-4,4,2]$

Based on the given graph, we can identify the viewing window as $X[-6,6,2]$ by $Y[-4,4,2]$ where the first number in the bracket represents the minimum value, the second number the maximum value, and the last number the scale.