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If (x + y = 24) and (3x - 2y = 37), what is the value of (2x + y)?

Answer and explanation

Correct answer: 41

The governing concept is substitution for a pair of simultaneous linear equations. From x + y = 24, isolate x to obtain x = 24 - y. Substitute this expression into 3x - 2y = 37: 3(24 - y) - 2y = 37. Simplifying gives 72 - 3y - 2y = 37, so 72 - 5y = 37 and 5y = 35. Thus y = 7, and x = 24 - 7 = 17. The requested expression is 2x + y, not either original equation. Substitution of the values gives 2(17) + 7 = 34 + 7 = 41. Therefore option D is correct. The other choices do not result from the required expression and may arise from incomplete substitution or arithmetic mistakes.

Related tags

Linear-EquationsSubstitution-MethodSimultaneous-EquationsExpression-EvaluationAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathema

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