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If (x+2y=11) and (3x-y=8), what is the value of (x+y)?

Answer and explanation

Correct answer: \(\frac{52}{7}\)

From the second equation, \(y=3x-8\). Substituting this into \(x+2y=11\) gives \(x+2(3x-8)=11\), so \(7x=27\) and \(x=\frac{27}{7}\). Then \(y=3\times\frac{27}{7}-8=\frac{25}{7}\). Hence, \(x+y=\frac{27}{7}+\frac{25}{7}=\frac{52}{7}\). The option \(8\) may result from assuming integer values, but the given equations have fractional solutions. Exam tip: when adding fractions with the same denominator, add only their numerators.

Related tags

Pair Of Linear EquationsSubstitution MethodLinear AlgebraClass 10MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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