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What value of (a) gives infinitely many solutions for (5x+ay=15) and (10x+6y=30)?

Answer and explanation

Correct answer: 3

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, \(\frac{5}{10}=\frac{a}{6}=\frac{15}{30}=\frac{1}{2}\). Thus, \(\frac{a}{6}=\frac{1}{2}\), giving \(a=3\). Therefore, option B is correct. Exam tip: infinitely many solutions require all three corresponding ratios to be equal, not just two of them.

Related tags

Linear EquationsConditions For SolvabilityInfinite SolutionsParameter ValuePair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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