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Solving \(\frac{x}{5}-\frac{y}{2}=1\) and \(\frac{x}{2}+\frac{y}{5}=11\), what is the value of \(x\)?

Answer and explanation

Correct answer: \(\frac{570}{29}\)

Multiplying both equations by 10 gives \(2x-5y=10\) and \(5x+2y=110\). Multiply the first equation by 2 and the second by 5 to obtain \(4x-10y=20\) and \(25x+10y=550\). Adding them gives \(29x=570\), so \(x=\frac{570}{29}\). Although \(20\) is a nearby value, it does not satisfy the system. Exam tip: For linear equations containing fractions, first multiply by the LCM to remove the fractions.

Related tags

Pair Of Linear EquationsElimination MethodFractional EquationsAlgebraClass 10 MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Varia

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