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What will (k) be for (5x+ky=25) and (x+3y=5) to have infinitely many solutions?

Answer and explanation

Correct answer: 15

For two linear equations to have infinitely many solutions, \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\) must hold. Here, \(\frac{5}{1}=\frac{25}{5}=5\). Therefore, \(\frac{k}{3}=5\), giving \(k=15\). Hence, option B is correct. Exam tip: In the infinitely many solutions case, the corresponding coefficients and constants are proportional.

Related tags

Linear EquationsInfinite SolutionsConditions For SolvabilityPair Of EquationsParameterPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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