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What is the solution of (4x-y=14) and (2x+y=16)?

Answer and explanation

Correct answer: (5, 6)

The elimination method is immediate because the y-coefficients are -1 and +1. Adding the two equations, (4x-y)+(2x+y)=14+16, cancels y and gives 6x=30. Therefore x=5. Substituting x=5 into 2x+y=16 gives 10+y=16, so y=6. The solution is (5,6), which is option A. Verification gives 4(5)-6=20-6=14 and 2(5)+6=10+6=16, confirming both equations. Option B reverses the values and gives 24-5=19 in the first equation. Option C gives 16-7=9, and option D gives 28-4=24; neither satisfies the system. The key governing idea is that adding equations with opposite coefficients eliminates one variable without changing the common solution.

Related tags

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

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