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What type of line does (x=7) represent?

Answer and explanation

Correct answer: Line parallel to (y)-axis

The direct answer is option D, a line parallel to the y-axis. In x=7, the x-coordinate is fixed at 7, while y may take any real value. Thus points such as (7,0), (7,2), and (7,-3) lie on the line. Joining them gives a vertical line, and vertical lines are parallel to the y-axis. Option A is wrong because the origin (0,0) does not satisfy x=7. Option B is wrong because a line parallel to the x-axis has constant y, not constant x. Option C is wrong because x=7 clearly represents many points and therefore a line. Option D correctly describes it. Exam cue: x fixed means vertical; y fixed means horizontal.

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Vertical LineAxisGraph

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