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What type of lines are (2x+y=5) and (8x+4y=20)?

Answer and explanation

Correct answer: Coincident lines

The direct answer is C: coincident lines. In the first equation, every term is multiplied by 4: 4(2x+y=5) gives 8x+4y=20, exactly the second equation. Thus both equations describe the same set of points, not two different lines. Step by step, compare coefficients: 8/2=4, 4/1=4, and 20/5=4, so the ratios are equal. A is wrong because parallel distinct lines have no common point, whereas these lines have all points in common. B is wrong because intersecting lines have one common point, not infinitely many. C is correct because the graphs overlap completely and every point on the line is a solution of both equations. D is wrong because perpendicular lines meet at a right angle and these are the same line. Memory cue: if all three coefficients, including the constant, have the same multiplier, the lines are coincident and there are infinitely many solutions.

Related tags

Coincident LinesInfinite SolutionsGraphical Method

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