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On solving (5x+2y=24) and (3x+4y=22), what is (y)?

Answer and explanation

Correct answer: \(y=\frac{19}{7}\)

Multiply the first equation by 2 to get \(10x+4y=48\). Subtract \(3x+4y=22\) from it: \(7x=26\), so \(x=\frac{26}{7}\). Substituting this into \(5x+2y=24\) gives \(2y=24-\frac{130}{7}=\frac{38}{7}\), hence \(y=\frac{19}{7}\). The distractor \(y=2\) does not satisfy the original equations. Exam tip: make one variable’s coefficients equal before subtracting to eliminate it quickly.

Related tags

Pair Of Linear EquationsElimination MethodSubstitution MethodValue Of YClass 10 AlgebraAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variabl

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