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If (2x+y=23) and (x+3y=19), what is the value of (x-2y)?

Answer and explanation

Correct answer: \(4\)

From the first equation, \(y=23-2x\). Substituting this into \(x+3y=19\) gives \(x+3(23-2x)=19\), so \(-5x=-50\), hence \(x=10\) and \(y=3\). Therefore, \(x-2y=10-2(3)=4\). Option \(5\) would be obtained for \(x-y\), not for the required expression. Exam tip: verify the values in both original equations after solving.

Related tags

Pair Of Linear EquationsSubstitution MethodAlgebraic ExpressionsClass 10 MathematicsElimination And SubstitutionAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear

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