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Class 10 Mathematics Pair of Linear Equations in Two Variables Algebraic methods: Substitution method and Elimination method.Hard

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What is the value of (x+y) from (0.2x+0.5y=3.1) and (0.4x-0.1y=1.3)?

Answer and explanation

Correct answer: (x+y=\frac{97}{11})

Removing decimals gives (2x+5y=31) and (4x-y=13). The solution is (x=\frac{48}{11},\ y=\frac{49}{11}), so (x+y=\frac{97}{11}).

Related tags

Linear Equations Decimal Equations Expression Value Hard Class 10 Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination Method Pair Of Linear Equations In Two Variables

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