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What is the value of (a) for (ax+4y=20) and (9x+12y=61) to have no solution?

Answer and explanation

Correct answer: 3

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, \(\frac{a}{9}=\frac{4}{12}=\frac{1}{3}\), giving \(a=3\). Also, \(\frac{20}{61}\ne\frac{1}{3}\), so the two lines are distinct and parallel and therefore have no solution. In an exam, first equate the ratios of the variable coefficients to find the parameter, then verify the ratio of the constants.

Related tags

Linear EquationsNo SolutionConditions For SolvabilityParallel LinesParameterPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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