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What is the value of a for the pair of equations 3x + ay = 12 and 6x + 8y = 24 to have infinitely many solutions?

Answer and explanation

Correct answer: 4

A pair of linear equations has infinitely many solutions when the corresponding coefficient ratios are equal, namely a₁/a₂ = b₁/b₂ = c₁/c₂. For 3x + ay = 12 and 6x + 8y = 24, the x-coefficient ratio is 3/6 = 1/2 and the constant ratio is 12/24 = 1/2. Hence the y-coefficient ratio must also equal 1/2: a/8 = 1/2. Multiplying both sides by 8 gives a = 4. Substituting this value makes the first equation 3x + 4y = 12; multiplying it by 2 gives 6x + 8y = 24, the second equation. Thus the lines coincide and infinitely many points satisfy both equations. Option B is correct.

Related tags

Linear EquationsInfinite SolutionsParameterCoefficient RatiosConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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