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If (\frac{x+y}{2}=9) and (\frac{x-y}{3}=2), what are the values of (x) and (y)?

Answer and explanation

Correct answer: \(x=12,\ y=6\)

Multiplying the first equation by 2 gives \(x+y=18\), and multiplying the second equation by 3 gives \(x-y=6\). Adding these equations gives \(2x=24\), so \(x=12\). Substituting \(x=12\) into \(x+y=18\) gives \(y=6\). In option B, \(x-y=2\), so it does not satisfy the second equation. Exam tip: For linear equations involving fractions, first clear the denominators and then use elimination.

Related tags

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

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