The inequality is .

Apply subtraction property of inequality: Subtract 2.5 from each side.

                  (Apply additive inverse property: )

                         (Apply additive identity property: )

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 less than or equal to 0 in .

          (Substitute )

                 (Apply additive identity property: )

The inequality is true.

The inequality solution set is .