The equations are

                   Equation (1)

                         Equation (2)

Rewrite the equation .

Apply addition property of equality: If a = b then a b = b a.

Subtract 2b from each side.

                 Equation (3)

Subtract the equation (2) and equation (3) to eliminate the a variable.

          (Subtract the corresponding columns)

Apply division property of equality: if a = b, then.

Divide each side by 3.

Substitute  in equation (3).

Apply addition property of equality: If a = b then a b = b a.

Subtract 2 from each side.

Apply Additive inverse property: .

Apply Additive identity property: .

Apply division property of equality: if a = b, then.

Divide each side by 3.

The solution is .

The solution is .