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On solving (0.6x-0.3y=2.7) and (0.2x+0.5y=3.1), what is (x)?

Answer and explanation

Correct answer: \(\frac{19}{3}\)

Multiply both equations by 10 to remove decimals: \(6x-3y=27\) and \(2x+5y=31\). Dividing the first equation by 3 gives \(2x-y=9\), so \(y=2x-9\). Substituting this into the second equation gives \(2x+5(2x-9)=31\), hence \(12x=76\) and \(x=\frac{19}{3}\). \(\frac{38}{7}\) is incorrect because correct substitution or elimination gives a denominator of 3. Exam tip: remove decimals first when solving linear equations to reduce calculation errors.

Related tags

Linear EquationsDecimal CoefficientsSubstitution MethodElimination MethodClass 10 AlgebraAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Varia

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