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What is the solution of (8x-3y=13) and (2x+3y=17)?

Answer and explanation

Correct answer: \(x=3,\ y=\frac{11}{3}\)

Adding the two equations gives \((8x-3y)+(2x+3y)=13+17\), so \(10x=30\). Hence, \(x=3\). Substituting this into \(2x+3y=17\) gives \(6+3y=17\), and therefore \(y=\frac{11}{3}\). Option B does not satisfy the first equation when \(x=4\) and \(y=3\) are substituted. Exam tip: add equations first when a variable has opposite coefficients, so that variable is eliminated directly.

Related tags

Pair Of Linear EquationsElimination MethodSubstitution MethodSimultaneous EquationsAlgebraAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Vari

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