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For infinitely many solutions of (u + 3)x + 8y = 16 and 10x + 20y = 40, what is u?

Answer and explanation

Correct answer: u = 1

Infinitely many solutions occur when both equations represent the same straight line. Thus, the ratios of corresponding coefficients and constants must be equal. For the second equation and the constants, 8/20 = 2/5 and 16/40 = 2/5. Therefore the x-coefficient ratio must also satisfy (u + 3)/10 = 2/5. Multiplying by 10 gives u + 3 = 4, so u = 1. A direct check confirms that the first equation becomes 4x + 8y = 16, which is obtained by multiplying 10x + 20y = 40 by 2/5. Hence both equations are coincident and have infinitely many common points. Option A is correct. The other listed values fail the proportionality condition.

Related tags

Class10Linear-EquationsInfinite-SolutionsSolvabilityConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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