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What is the value of k for no solution in 2x + 3y = 4 and kx + 6y = 11?

Answer and explanation

Correct answer: k = 4

A pair of linear equations has no solution when the corresponding coefficient ratios are equal but the constant ratio is different: a₁/a₂ = b₁/b₂ ≠ c₁/c₂. Here, the y-coefficient ratio is 3/6 = 1/2. To make the x-coefficient ratio equal to it, 2/k = 1/2, which gives k = 4. Now check the constants: 4/11 is not equal to 1/2. Thus the equations have proportional x- and y-coefficients but non-proportional constants. Geometrically, their lines have the same slope but different intercepts, so they are parallel and never meet. Therefore no solution exists, and option C is correct. Other values do not make the coefficient ratios equal.

Related tags

Class10Linear-EquationsNo-SolutionParallel-LinesConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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