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If 3x + 2y = 28 and mx - 2y = 12 have solution x = 5, what is the value of m?

Answer and explanation

Correct answer: 5

The key principle is that the stated solution must satisfy both equations. Begin with the first equation and use x = 5: 3(5) + 2y = 28. Thus 15 + 2y = 28, giving 2y = 13 and y = 13/2. Substitute x = 5 and y = 13/2 into the second equation: 5m - 2(13/2) = 12. The product 2(13/2) equals 13, so 5m - 13 = 12. Therefore 5m = 25 and m = 5. Hence option C is correct. A check gives 15 + 13 = 28 in the first equation and 5(5) - 13 = 12 in the second. Values 3, 4, and 6 would make the second left side 2, 7, and 17, respectively, rather than 12.

Related tags

Pair-Linear-EquationsUnknown-ParameterKnown-SolutionAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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