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What is the value of \(x-y\) from \(\frac{x+4y}{5}=10\) and \(\frac{3x-y}{4}=7\)?

Answer and explanation

Correct answer: \(x-y=\frac{40}{13}\)

Multiplying the given equations by 5 and 4 gives \(x+4y=50\) and \(3x-y=28\). From the second equation, \(y=3x-28\). Substituting this into the first equation gives \(x+12x-112=50\), so \(13x=162\). Hence, \(x=\frac{162}{13}\) and \(y=\frac{122}{13}\). Therefore, \(x-y=\frac{40}{13}\). Exam tip: For linear equations containing fractions, first clear the denominators to obtain simpler integer-coefficient equations.

Related tags

Linear EquationsSubstitution MethodElimination MethodAlgebraic MethodsClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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