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What is the value of (b) for (5x+by=20) and (10x+6y=40) to have infinitely many solutions?

Answer and explanation

Correct answer: 3

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, \(\frac{5}{10}=\frac{20}{40}=\frac{1}{2}\), so \(\frac{b}{6}=\frac{1}{2}\), giving \(b=3\). If \(b=4\), then \(\frac{b}{6}\neq\frac{1}{2}\), so the equations would not have infinitely many solutions. Exam tip: For infinitely many solutions, verify that all three corresponding ratios are equal.

Related tags

Linear EquationsInfinitely Many SolutionsConditions For SolvabilityParameterDependent EquationsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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