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If (2x-y=5) and (x=4), find the value of (y).

Answer and explanation

Correct answer: \(y=3\)

Given \(x=4\), substitute it in \(2x-y=5\): \(2(4)-y=5\), so \(8-y=5\). Hence, \(-y=-3\) and therefore \(y=3\). If \(y=5\), the left-hand side becomes \(8-5=3\), not 5. Exam tip: After substitution, change signs carefully when removing a negative term.

Related tags

Linear EquationsSubstitution MethodAlgebraClass 10Solving EquationsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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