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What will (k) be for (6x+ky=42) and (2x+5y=14) to have infinitely many solutions?

Answer and explanation

Correct answer: 15

For two linear equations to have infinitely many solutions, the condition is \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\). Here, \(\frac{6}{2}=3\) and \(\frac{42}{14}=3\), so \(\frac{k}{5}=3\), giving \(k=15\). Therefore, option B is correct. With option C, \(k=18\), the ratio \(\frac{k}{5}\) is not 3, so the equations do not represent the same line. Exam tip: For infinitely many solutions, check that all three corresponding ratios are equal.

Related tags

Linear EquationsInfinite SolutionsSolvability ConditionsPair Of EquationsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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