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What will (k) be for (2x+3y=6) and (kx+6y=15) to have no solution?

Answer and explanation

Correct answer: 4

For two linear equations to have no solution, the condition is \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\ne\frac{c_1}{c_2}\). Here, \(\frac{2}{k}=\frac{3}{6}=\frac{1}{2}\), which gives \(k=4\). Also, \(\frac{6}{15}=\frac{2}{5}\), which is not equal to \(\frac{1}{2}\); hence the two lines are distinct parallel lines and the system is inconsistent. In an exam, first equate the ratios of the variable coefficients, then verify the condition using the constants.

Related tags

Linear EquationsConditions For SolvabilityNo SolutionParameterParallel LinesPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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