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

Answer and explanation

Correct answer: \(x=7\)

Given \(y=2\), substitute it into \(x-3y=1\): \(x-3(2)=1\), so \(x-6=1\). Adding 6 to both sides gives \(x=7\). If \(x=8\), the left-hand side becomes \(8-6=2\), not 1. Exam tip: after substitution, simplify brackets and negative signs carefully.

Related tags

Pair Of Linear EquationsSubstitution MethodLinear EquationsSolve For XClass 10 AlgebraAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variable

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