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What type of lines are (2x+y=4) and (6x+3y=12)?

Answer and explanation

Correct answer: Coincident lines

The direct answer is option C, coincident lines. Multiply the first equation by 3: 3(2x+y=4) gives 6x+3y=12, which is exactly the second equation. Therefore both equations represent the same line, not two separate lines. Every point on one is on the other, so there are infinitely many solutions. Option A, parallel lines, is wrong because the equations are not distinct. Option B, intersecting at one point, is wrong because identical lines share infinitely many points. Option D, perpendicular lines, is wrong because no perpendicular relationship is produced by simply multiplying an entire equation by 3. Memory cue: if one complete linear equation is a nonzero multiple of the other, the lines are coincident.

Related tags

Coincident LinesInfinite SolutionsGraphical Method

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