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Which ordered pair satisfies \(7x-3y=22\) and \(2x+3y=23\)?

Answer and explanation

Correct answer: \(x=5,\ y=\frac{13}{3}\)

Adding the two equations gives \(7x-3y+2x+3y=22+23\), so \(9x=45\). Hence, \(x=5\). Substituting this into \(2x+3y=23\) gives \(10+3y=23\), and therefore \(y=\frac{13}{3}\). Thus, the correct ordered pair is \(\left(5,\frac{13}{3}\right)\). In option A, substituting \(x=4\) does not satisfy the first equation. Exam tip: When coefficients have opposite signs, add the equations first to eliminate that variable quickly.

Related tags

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

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