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Solve by elimination: x − y = 3 and x + y = 11.

Answer and explanation

Correct answer: (x, y) = (7, 4)

The governing principle of elimination is to combine equations so that one variable disappears. Here the y coefficients are −1 and +1, so adding the equations is appropriate: (x − y) + (x + y) = 3 + 11. The y terms cancel and produce 2x = 14, so x = 7. Substitute x = 7 into the first equation: 7 − y = 3. Subtracting 7 gives −y = −4, hence y = 4. The ordered solution is therefore (x, y) = (7, 4), making option D correct. Checking the second equation gives 7 + 4 = 11, and the first gives 7 − 4 = 3. The other ordered pairs fail one or both equations.

Related tags

Linear EquationsElimination MethodOrdered PairSimultaneous EquationsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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