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What will (a) be for (3x+4y=10) and (6x+ay=25) to have no solution?

Answer and explanation

Correct answer: 8

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, \(\frac{3}{6}=\frac{1}{2}\) and \(\frac{10}{25}=\frac{2}{5}\), so the constant-term ratio is different. Therefore, set \(\frac{4}{a}=\frac{3}{6}=\frac{1}{2}\), which gives \(a=8\). Hence, option C is correct. Exam tip: First equate the ratios of the coefficients of the variables, then verify that the ratio of constants is different.

Related tags

Linear EquationsNo SolutionSolvability ConditionsParameterConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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