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

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If (7x+6y=70) and (7x-4y=20), what is the value of (x-y)?

Answer and explanation

Correct answer: (x-y=\frac{5}{7})

Subtracting the second equation from the first gives (10y=50), so (y=5). Then (x=\frac{40}{7}), hence (x-y=\frac{5}{7}).

Related tags

Linear Equations Elimination Expression Value Expert 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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