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What is the value of (x+y) from (0.5x+0.4y=6.1) and (0.3x-0.2y=1.7)?

Answer and explanation

Correct answer: \(x+y=\frac{144}{11}\)

Multiply both equations by 10 to remove decimals: \(5x+4y=61\) and \(3x-2y=17\). Multiply the second equation by 2 and add it to the first equation: \(11x=95\), so \(x=\frac{95}{11}\). Substituting into \(3x-2y=17\) gives \(y=\frac{49}{11}\). Therefore, \(x+y=\frac{95}{11}+\frac{49}{11}=\frac{144}{11}\). A value such as \(\frac{139}{11}\) results from an incorrect addition or calculation. Exam tip: for linear equations with decimals, first clear the decimals to make elimination easier.

Related tags

Pair Of Linear EquationsElimination MethodDecimal CoefficientsAlgebraic MethodsClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variabl

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