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If (4a+3b=276) and (2a+5b=250), what is the value of (a)?

Answer and explanation

Correct answer: \(a=45\)

Multiply the second equation, \(2a+5b=250\), by 2 to get \(4a+10b=500\). Subtracting \(4a+3b=276\) gives \(7b=224\), so \(b=32\). Substituting this into \(2a+5b=250\) gives \(2a+160=250\), hence \(a=45\). For example, \(a=40\) does not satisfy both equations together. Exam tip: in elimination, first make the coefficients of one variable equal.

Related tags

Pair Of Linear EquationsElimination MethodAlgebraClass 10MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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