Elimination Method:

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 s.

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

Divide each side by 3.

Now, find the s value by substituting  in either equation.

              (Equation 2)

Add s to each side.

Subtract 1 from each side.

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The solution is .