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What is the value of \(x\) from \(\frac{x}{6}+\frac{y}{3}=6\) and \(\frac{x}{2}-\frac{y}{4}=5\)?

Answer and explanation

Correct answer: \(x=\frac{76}{5}\)

Multiplying the first equation by 6 gives \(x+2y=36\), and multiplying the second equation by 4 gives \(2x-y=20\). Multiply the second equation by 2: \(4x-2y=40\). Adding it to the first equation gives \(5x=76\), so \(x=\frac{76}{5}\). A value such as \(\frac{72}{5}\) does not satisfy both equations on substitution. Exam tip: In linear equations involving fractions, first clear the denominators to simplify elimination.

Related tags

Linear EquationsSimultaneous EquationsElimination MethodFractional EquationsClass 10 AlgebraAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Va

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