The equations are

 Since the coefficients of the y-terms,+1 and -1,are additive inverses,

you can eliminate these terms by adding the equations. .

add the equations to eliminate variable y.

          (Write the equations in column form and add)

                      (Divide each side by 4)

                             (Cancel common terms)

Now Substitute for x  in either equation to find the value of y.

   (Equation 1)

                           (Multiply:  )                           

                (Subtract 3 from each side)

             (Commutative property:  a+b=b+a)

                   (Additive inverse property: )

                         (Additive indentity property: )

                              (Subtract:  )

                 (Multiply each side by negative one)

                           (Product of two same signs is positive)

                               (Product of two diffirent signs is negative)

The solution is .

The solution is .