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What value of (k) makes (3x+ky=9) and (6x+8y=20) have no solution?

Answer and explanation

Correct answer: 4

For two linear equations to have no solution, the condition is \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\neq\frac{c_1}{c_2}\). Here, \(\frac{3}{6}=\frac{k}{8}\), which gives \(k=4\). Also, \(\frac{9}{20}\neq\frac{1}{2}\), so the two lines are parallel and inconsistent. Exam tip: first equate the ratios of the variable coefficients, then check that the ratio of the constants is different.

Related tags

Linear EquationsSolvability ConditionsParallel LinesParameterConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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