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What is the value of (x) from (\frac{3x-y}{4}=5) and (\frac{x+2y}{3}=7)?

Answer and explanation

Correct answer: \(x=\frac{61}{7}\)

Multiplying the first equation by 4 gives \(3x-y=20\), and multiplying the second equation by 3 gives \(x+2y=21\). From \(3x-y=20\), we get \(y=3x-20\). Substituting this into \(x+2y=21\) gives \(x+2(3x-20)=21\), so \(7x=61\). Hence, \(x=\frac{61}{7}\). A close option such as \(\frac{62}{7}\) does not satisfy \(7x=61\). Exam tip: First clear the denominators in fractional equations to obtain simpler linear equations.

Related tags

Pair Of Linear EquationsSubstitution MethodElimination MethodLinear EquationsClass 10 AlgebraAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two V

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