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On solving (0.3x+0.2y=2.7) and (0.5x-0.1y=1.4), what is (y)?

Answer and explanation

Correct answer: \(\frac{93}{13}\)

Multiplying both equations by 10 gives \(3x+2y=27\) and \(5x-y=14\). From the second equation, \(y=5x-14\). Substituting this into the first equation gives \(3x+2(5x-14)=27\), so \(13x=55\). Hence, \(y=5\times\frac{55}{13}-14=\frac{93}{13}\). The value \(\frac{105}{13}\) does not satisfy both equations simultaneously. Exam tip: For linear equations containing decimals, first multiply by 10 or a suitable power of 10 to remove decimals.

Related tags

Pair Of Linear EquationsSubstitution MethodElimination MethodDecimal EquationsClass 10 MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In

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