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Solve 7x − 2y = 41 and 7x + 2y = 57 by elimination.

Answer and explanation

Correct answer: (7, 4)

The governing concept is elimination of opposite terms in a pair of simultaneous linear equations. Here the coefficients of y are −2 and +2, so adding the equations removes y without first solving for either variable: (7x − 2y) + (7x + 2y) = 41 + 57. Thus 14x = 98 and x = 7. Substitute x = 7 into 7x + 2y = 57: 49 + 2y = 57, so 2y = 8 and y = 4. Therefore the ordered pair is (7, 4), making option C correct. Verification gives 49 − 8 = 41 and 49 + 8 = 57 in the original equations. The other ordered pairs fail at least one equation and therefore cannot be the simultaneous solution.

Related tags

Linear EquationsElimination MethodSimultaneous EquationsClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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