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What will (k) be for the equations (8x+ky=72) and (2x+7y=18) to have infinitely many solutions?

Answer and explanation

Correct answer: 28

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, \(\frac{8}{2}=\frac{72}{18}=4\), so \(\frac{k}{7}=4\), giving \(k=28\). Therefore, option C is correct. Exam tip: Find the ratio of the constant terms first and make the corresponding coefficient ratio equal to it.

Related tags

Linear EquationsInfinitely Many SolutionsSolvability ConditionsParameterDirect ProportionConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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