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What will (k) be for the equations (9x+ky=81) and (3x+8y=27) to have infinitely many solutions?

Answer and explanation

Correct answer: 24

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, \(\frac{9}{3}=\frac{81}{27}=3\), so \(\frac{k}{8}=3\), giving \(k=24\). Therefore, option C is correct. Exam tip: For infinitely many solutions, verify equality of all three ratios, not just two of them.

Related tags

Linear EquationsInfinitely Many SolutionsSolvability ConditionsParameter ValueClass 10Conditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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