The equations are

Since the coefficients of the y-terms,+1and +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 add)

                     (Divide each side by 3)

                            (Cancel common terms)

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

    (Equation 1)                           

             (Add 1 to each side)

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

                     (Additive inverse property: )

                           (Additive indentity property: )

                                 (Add:  )

The solution is .

The solution is .