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If \(3x+4y=26\) and \(5x-2y=22\), what is the value of (2x+y)?

Answer and explanation

Correct answer: \(\frac{172}{13}\)

The equations are \(3x+4y=26\) and \(5x-2y=22\). Multiplying the second equation by 2 gives \(10x-4y=44\). Adding it to the first equation eliminates \(y\): \(13x=70\), so \(x=\frac{70}{13}\). Substituting this into the second equation gives \(y=\frac{32}{13}\). Therefore, \(2x+y=2\left(\frac{70}{13}\right)+\frac{32}{13}=\frac{172}{13}\). Hence, option D is correct. Exam tip: Substitute the calculated values back into both original equations to verify the solution.

Related tags

Pair Of Linear EquationsElimination MethodSubstitution MethodAlgebraic EquationsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathe

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