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

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If (3x+2y=20) and (x-y=1), what is the value of (3x-y)?

Answer and explanation

Correct answer: (11)

Using (x=y+1) gives (3y+3+2y=20), so (y=\frac{17}{5}) and (x=\frac{22}{5}). Then (3x-y=\frac{49}{5}).

Related tags

Linear Equations Substitution Expression Value Medium 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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