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For infinitely many solutions of (3x+ay=6) and (9x+12y=b), what is ((a,b))?

Answer and explanation

Correct answer: \((4,18)\)

For infinitely many solutions, both equations must represent the same line. Hence, \(\frac{3}{9}=\frac{a}{12}=\frac{6}{b}\). Since \(\frac{3}{9}=\frac{1}{3}\), we get \(a=4\) and \(b=18\). In \((4,12)\), \(\frac{6}{b}=\frac{1}{2}\), so it cannot give infinitely many solutions. Exam tip: for infinitely many solutions, equate all three coefficient ratios.

Related tags

Class 10 MathematicsPair Of Linear EquationsInfinitely Many SolutionsConsistency ConditionsCoefficient RatiosConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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