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On solving (0.2x+0.8y=5.6) and (0.5x-0.3y=2.7), what is (x)?

Answer and explanation

Correct answer: \(x=\frac{192}{23}\)

Multiplying both equations by 10 gives \(2x+8y=56\) and \(5x-3y=27\). Multiply the first equation by 3 and the second by 8 to get \(6x+24y=168\) and \(40x-24y=216\). Adding them gives \(46x=384\), so \(x=\frac{384}{46}=\frac{192}{23}\). Although \(\frac{202}{23}\) is close, it does not result from elimination. Exam tip: For linear equations with decimals, first multiply by a suitable power of 10 to remove decimals.

Related tags

Pair Of Linear EquationsElimination MethodDecimal CoefficientsAlgebraClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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