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How will the lines (2x+4y=16) and (x+2y=8) appear on a graph?

Answer and explanation

Correct answer: Coincident

Direct answer: option C, coincident lines. Two equations represent the same line when one equation is a nonzero multiple of the other. Start with 2x+4y=16 and divide every term by 2: x+2y=8. This is exactly the second equation, so both graphs lie on top of each other. Every point on that one line satisfies both equations; therefore there are infinitely many common solutions. Option A, parallel and distinct, is wrong because distinct parallel lines have no common point, whereas these equations are identical after simplification. Option B, intersecting at one point, is wrong because identical lines do not cross at only one point. Option D, perpendicular, is wrong because perpendicular lines meet at a right angle and are not identical. Hence C is correct. Memory cue: proportional all three coefficients means coincident lines.

Related tags

Coincident LinesInfinite SolutionsGraphical Method

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