The inequality is .

Case 1: If a b Then

Case 2: If a b Then

(Multiply each side by negative sign and flip the symbol)

              (Product of two same signs is positive)

Solve inequality for case 1.

Apply addition property of inequality: Add 2 to each side.

                 (Apply additive inverse property: )

                     (Add: )

Solve inequality for case 2.

Apply addition property of inequality: Add 2 to each side.

              (Apply additive inverse property: )

                    (Add: )

Graph the solution set on a number line.

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

The solution set is .