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What will (k) be for the equations (10x+ky=110) and (2x+9y=22) to have infinitely many solutions?

Answer and explanation

Correct answer: 45

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, \(\frac{10}{2}=\frac{110}{22}=5\), so \(\frac{k}{9}=5\), which gives \(k=45\). Therefore, option C is correct. Exam tip: compare the constant-term ratio first, then equate the corresponding coefficient ratio to it.

Related tags

Linear EquationsInfinite SolutionsSolvability ConditionsParameterAlgebraConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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