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What is the value of \(x\) from \(\frac{2x-y}{5}=4\) and \(\frac{x+3y}{4}=8\)?

Answer and explanation

Correct answer: \(x=\frac{92}{7}\)

First simplify the equations: \(2x-y=20\) and \(x+3y=32\). From the first equation, \(y=2x-20\). Substituting this into the second equation gives \(x+3(2x-20)=32\), so \(7x=92\). Hence, \(x=\frac{92}{7}\). A close option such as \(\frac{90}{7}\) can result from an error while combining the constant terms. Exam tip: In linear equations containing fractions, first multiply both sides by the denominator to remove the fractions.

Related tags

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

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