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The equations are

                               Equation (1)

                                  Equation (2)

Since the coefficients of the s-terms are additive inverses, you can eliminate these terms by adding the equations. Add the equations to eliminate variable t.

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

                                    (Divide each side by 2)

                                      (Divide: )

Now Substitute 3 for s in either equation to find the value of t.

                                (Equation 1)

                                (Replace s by 3)                             

                    (Subtract 3 from each side)

                                    (Multiply each side by negative one)

The solution is .

The solution is