The equations are

                        Equation (1)

                          Equation (2)

Since the coefficients of the m-terms are same, you can eliminate these terms by subtracting the equations. Subtract the equations to eliminate variable m.

Write the equations in column form and subtract the corresponding columns.

              (Write the equations in column form and add)

.

Now Substitute –2 for n in either equation to find the value of m.

                        (Equation 1)

                  (Replace n by –2)

                       (Multiply: )              

           (Add 4 to each side)

                          (Additive inverse property: ) \ \

                              (Add: )

                        (Divide each side by negative 4)

                               (Cancel common terms) \ \

                              (Divide: )

The solution is . \ \

The solution is .