The equations are

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

you can eliminate these terms by subtracting the equations. .

Subtract the equations to eliminate variable y.

  (Write the equations in column form and subtract)

Apply division property of equality: Divide each side by 3.

                            (Cancel common terms)

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

  (Equation 1)

Apply addition property of equality: Add 1 to each side.

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

                    (Apply additive inverse property: )

                           (Apply additive identity property: )

                                 (Add: )

The solution is .

The solution is .