The inequality is .

Apply addition property of inequality: .

                   (Add 9 to each side)

                         (Apply additive inverse property: )

                              (Apply additive identity property: )

                                  (Add: )

The solution set is .

Graph the solution set on a number line.

Note:

The point indicated with closed circle is included in the solution set.

Check:

To check, substitute a number less than or equal to 10 in .

                        (Substitute )

                                (Substract: )

The inequality is true.

The graph of is

The inequality solution set is .