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A student writes only (1) solution for (2x+4y=16) and (x+2y=8). 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 only one solution. A pair of linear equations represents two lines. Here, multiplying x+2y=8 by 2 gives 2x+4y=16, exactly the first equation. Therefore both equations describe the same line, not two different lines. Every point on that line satisfies both equations, so there are infinitely many solutions. Option A is wrong because parallel distinct lines have no solution, whereas these lines are the same. Option B is correct because coincident lines have infinitely many common points. Option C is wrong because intersecting lines have exactly one solution and are consistent. Option D is unrelated; naming axes does not decide the number of solutions. Memory cue: same ratios in all coefficients mean coincident lines and infinitely many solutions.

Related tags

Common MistakeCoincident LinesInfinite Solutions

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