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Which is the solution of 2x + y = 16 and x − y = 2?

Answer and explanation

Correct answer: x = 6, y = 4

The governing concept is elimination by addition. In the equations 2x + y = 16 and x − y = 2, the coefficients of y are +1 and −1. Adding the equations therefore cancels y: (2x + y) + (x − y) = 16 + 2. This produces 3x = 18, so x = 6. Substituting x = 6 into x − y = 2 gives 6 − y = 2, hence y = 4. Therefore option D is the correct solution. Checking both equations confirms it: 2(6) + 4 = 16 and 6 − 4 = 2. The distractor (7,2) may seem close, but its second equation gives 5 rather than 2. The pairs in options A and B also fail one or both original equations.

Related tags

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

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