The equations are

            Equation (1)

                   Equation (2)

Rewrite the equation .

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

Add 0.5x to each side.

                      Equation (3)

Multiply equation (1) by 2.

                  Equation (4)

Subtract the equation (3) and equation (4) to eliminate the x variable.

          (Subtract the corresponding columns)

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

Divide each side by negative one.

Substitute in equation (3).

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

Subtract 1.25 from each side.

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

Divide each side by 0.5.

The solution is .

The solution is .