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)

Apply division property of equality: Divide each side by 4.

                      (Cancel common terms)

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

   (Equation 1)

                    (Product of two same signs is positive)

Apply subtraction property of equality: Subtract 3 from each side.

Apply commutative property of addition: a + b = b + a.

          (Apply additive inverse property: )

                 (Apply additive identity property: )

                       (Subtract:  )

Apply multiplication property of equality: 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 .