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How will the lines (3x+6y=18) and (x+2y=6) appear on a graph?

Answer and explanation

Correct answer: Coincident

The direct answer is B: coincident lines. Divide every term of 3x+6y=18 by 3. This gives x+2y=6, exactly the second equation. Hence both graphs are the same straight line and every point on it is a common solution. A is wrong because parallel and distinct lines have equal direction but different positions and no common point; these equations have identical positions. B is correct because the equations are equivalent. C is wrong because one intersection occurs when two non-identical lines cross at one point. D is wrong because perpendicular lines have slopes whose product is −1 and meet at a right angle; these lines overlap instead. For a quick coefficient check, the first equation has all parts three times the second: 3/1=3, 6/2=3, and 18/6=3. Thus the ratios match completely, giving infinitely many solutions. Memory cue: divide the larger-looking equation by a common factor before deciding the graph type.

Related tags

Coincident LinesInfinite SolutionsGraphical Method

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