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Which ordered pair satisfies (8x-5y=7) and (3x+5y=48)?

Answer and explanation

Correct answer: \(\left(5,\frac{33}{5}\right)\)

Adding the equations gives \(8x-5y+3x+5y=7+48\), so \(11x=55\). Hence, \(x=5\). Substituting this into \(3x+5y=48\) gives \(15+5y=48\), and therefore \(y=\frac{33}{5}\). Thus, the required ordered pair is \(\left(5,\frac{33}{5}\right)\). For example, option C cannot be correct because its \(x\)-value is 6, whereas elimination requires \(x=5\). Exam tip: add equations directly when one variable has equal and opposite coefficients.

Related tags

Pair Of Linear EquationsElimination MethodOrdered PairAlgebraic MethodsClass 10 MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Var

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