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

Answer and explanation

Correct answer: \(x=\frac{39}{4}\)

From the second equation, \(x=y+6\). Substituting this into the first equation gives \(\frac{y+6}{3}+\frac{y}{5}=4\). Multiplying by 15, \(5y+30+3y=60\), so \(8y=30\) and \(y=\frac{15}{4}\). Hence, \(x=\frac{15}{4}+6=\frac{39}{4}\). If \(x=\frac{37}{4}\), then \(x-y=6\) gives \(y=\frac{13}{4}\), which does not satisfy the first equation. Exam tip: after substitution in equations containing fractions, multiply by the LCM to clear the denominators.

Related tags

Pair Of Linear EquationsSubstitution MethodFractional EquationsAlgebraClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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