SOLUTION: Explain why x=4 is a vertical line

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Question 235602: Explain why x=4 is a vertical line
Answer by solver91311(24713) About Me  (Show Source):
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Because the equation describes a set of ordered pairs such that every -coordinate is 4 and the -coordinate can be any real number.

If two points on a line have the same -coordinate, that line must be vertical.

John