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From (x+4y=13) and (2x-y=8), what are (x) and (y)?

Answer and explanation

Correct answer: \((5,2)\)

From the second equation, \(2x-y=8\), we get \(y=2x-8\). Substituting this into \(x+4y=13\) gives \(x+4(2x-8)=13\), so \(9x=45\) and hence \(x=5\). Then \(y=2(5)-8=2\). Therefore, the correct ordered pair is \((5,2)\). Option \((4,3)\) satisfies the first equation but not \(2x-y=8\). Exam tip: always substitute the obtained values into both original equations to verify the answer.

Related tags

Pair Of Linear EquationsSubstitution MethodOrdered PairClass 10 AlgebraLinear EquationsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variabl

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