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On solving (0.5x-0.2y=1.9) and (0.3x+0.4y=2.6), what is (y)?

Answer and explanation

Correct answer: \(y=\frac{73}{26}\)

Multiplying both equations by 10 gives \(5x-2y=19\) and \(3x+4y=26\). Multiplying the first equation by 2 gives \(10x-4y=38\). Adding it to the second equation gives \(13x=64\), so \(x=\frac{64}{13}\). Substituting this into \(5x-2y=19\) gives \(y=\frac{73}{26}\). A nearby value such as \(\frac{68}{26}\) can result from an error in elimination or substitution. Exam tip: For linear equations with decimals, first multiply by 10 or 100 to remove the 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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