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A student writes only one solution for (2x+3y=12) and (4x+6y=24). What is the mistake?

Answer and explanation

Correct answer: Treating coincident lines as having one solution

The direct answer is B: the mistake is treating coincident lines as having one solution. Multiplying 2x+3y=12 by 2 gives 4x+6y=24, which is exactly the second equation. Thus both equations represent the same line. Their common points are not limited to one point; every point on that line is a solution, so there are infinitely many solutions. Option A describes distinct parallel lines, which have no common point, so it is wrong. Option B is correct. Option C describes a misunderstanding of intersecting lines; intersecting lines meet at one point and therefore give one consistent solution. Option D concerns coordinate order and has no connection with coincident lines. Memory cue: one equation being a non-zero multiple of the other means the same line and infinitely many solutions.

Related tags

Common MistakeCoincident LinesInfinite Solutions

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