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What is the value of (a) for the equations (4x+ay=28) and (12x+15y=84) to have infinitely many solutions?

Answer and explanation

Correct answer: (5)

For two linear equations to have infinitely many solutions, the condition is 4/12 = a/15 = 28/84. Since both 4/12 and 28/84 equal 1/3, we get a/15 = 1/3, giving a = 5. Hence, option B is correct. Exam tip: For infinitely many solutions, all three corresponding coefficient and constant ratios must be equal; checking only two ratios is not sufficient.

Related tags

Linear EquationsSolvability ConditionsInfinite SolutionsParameter ValueClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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