The inequality .

Apply addition property of inequality:  Add 8 to each side.

            (Additive inverse property: )

                  (Additive identity property: )

                         (Add: )

Graph the solution set on a number line.

Note: A dot means that this point is included in the solution set.

Check:

To check, substitute a number  greater than or equal to  9 in  .

                      (Substitute   )

                            (Subtract:   )

The inequality is true.

The inequality solution is .