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What will (b) be for (3x+by=15) and (9x+12y=45) to have infinitely many solutions?

Answer and explanation

Correct answer: 4

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, \(\frac{3}{9}=\frac{15}{45}=\frac{1}{3}\). Therefore, \(\frac{b}{12}=\frac{1}{3}\), which gives \(b=4\). Hence, option C is correct. Exam tip: For infinitely many solutions, check that all three corresponding coefficient and constant ratios are equal.

Related tags

Linear EquationsInfinitely Many SolutionsSolvability ConditionsParameterConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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