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Find the value of (x) from (4x-7y=-19) and (2x+y=13).

Answer and explanation

Correct answer: \(x=4\)

From the second equation, \(2x+y=13\), we get \(y=13-2x\). Substituting this into the first equation gives \(4x-7(13-2x)=-19\), so \(18x=72\). Hence, \(x=4\). If \(x=3\), the two equations do not give the same value of \(y\). Exam tip: while substituting, distribute the negative sign in \(-7(13-2x)\) carefully.

Related tags

Pair Of Linear EquationsSubstitution MethodElimination MethodLinear AlgebraClass 10 MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two

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