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What will (k) be for the equations (kx+10y=30) and (12x+15y=45) to have infinitely many solutions?

Answer and explanation

Correct answer: 8

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, \(\frac{10}{15}=\frac{30}{45}=\frac{2}{3}\), so \(\frac{k}{12}=\frac{2}{3}\), giving \(k=8\). Hence, option B is correct. Exam tip: for infinitely many solutions, verify equality of all three coefficient and constant-term ratios, not just two of them.

Related tags

Linear EquationsSolvability ConditionsParameterInfinitely Many SolutionsClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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