The equations are

           Equation(1)

               Equation(2)

\

Multiply the first equation by 4.

    Equation (3)

\

\

Since the coefficients of the y-terms are additive inverses, y-terms

can be eliminated by adding the equations 2 and 3. 

Write the equations in column form and add the corresponding columns. \ \

                     (Divide each side by 11)

                        (Cancel common terms)

                             (Divide: )

Substitute  in Equation (1).

  \ \

                   (Multiply: )

             (Subtract 4 from each side)

             (Commutative property: )

                   (Additive inverse property: )

                      (Additive identity property: )

                            (Subtract: )

               (Multiply each side by negative one)

                         (Product of two same signs is posivite)

                             (Product of twodifferent signs is negative)

The solution is.