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What is the solution of (2x+3y=18) and (3x-2y=5)?

Answer and explanation

Correct answer: (x=3, y=4)

To eliminate y, multiply the first equation by 2 and the second equation by 3. This gives 4x+6y=36 and 9x-6y=15. Adding them produces 13x=51, so x=51/13, not x=3. Substitution then gives 2(51/13)+3y=18, hence 102/13+3y=234/13, so 3y=132/13 and y=44/13. Therefore none of the supplied original options is correct. To preserve one unambiguous answer, the corrected options should include (x=51/13, y=44/13) as option A, while the other three options remain distinct distractors. Direct checking confirms 2(51/13)+3(44/13)=234/13=18 and 3(51/13)-2(44/13)=65/13=5. The earlier integer key (3,4) is invalid because it gives 18 in the first equation but only 1 in the second.

Related tags

Linear EquationsEliminationCoefficient ScalingClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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