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If (x=2y+1) and (5x-3y=33), which is the correct solution?

Answer and explanation

Correct answer: \(x=9,\ y=4\)

Substitute \(x=2y+1\) into the second equation: \(5(2y+1)-3y=33\). Thus, \(10y+5-3y=33\), so \(7y=28\) and \(y=4\). Now \(x=2(4)+1=9\). Therefore, the correct solution is \(x=9,\ y=4\). The close distractor \(x=7,\ y=3\) satisfies the first equation but gives \(5x-3y=26\), not 33. Exam tip: verify the ordered pair in both original equations.

Related tags

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

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