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If (4x-y=17) and (2x+3y=19), what will be the value of (x)?

Answer and explanation

Correct answer: \(x=5\)

From the first equation, \(y=4x-17\). Substituting this into the second equation gives \(2x+3(4x-17)=19\). Thus, \(14x-51=19\), so \(14x=70\) and \(x=5\). The nearby option \(x=4\) does not satisfy both equations together. Exam tip: after substitution, multiply 3 by both \(4x\) and \(-17\) while expanding the bracket.

Related tags

Pair Of Linear EquationsSubstitution MethodAlgebraValue Of XClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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