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What will (k) be for (4x+ky=16) and (x+3y=4) to have infinitely many solutions?

Answer and explanation

Correct answer: (12)

The direct answer is option C, k=12. Infinitely many solutions mean both equations represent the same line, so every coefficient and constant in one equation must have the same multiplier relative to the other. The second equation is x+3y=4. Multiplying it by 4 gives 4x+12y=16, which matches the first equation when k=12. Option A, 8, would give 4x+8y=16 and is not a scalar multiple of the second equation. Option B, 10, also fails because the y coefficient would not be 12. Option C gives exact equality of all three terms and therefore infinitely many solutions. Option D, 14, likewise fails the required multiplier condition. Memory cue: compare the fixed coefficients first; since 4x matches 4 times x and 16 matches 4 times 4, the middle coefficient must be 4 times 3, namely 12.

Related tags

Linear EquationsDependent PairParameter

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