SOLUTION: Why the line x=4 is a vertical line? (50 words response)

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Question 292452: Why the line x=4 is a vertical line? (50 words response)
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
What does 50 word response mean?
No less than 50 words?
No more than 50 words?
Exactly 50 words?
"x" never changes but y does.
"y" can be anything but x stays the same.
The line has an undefined slope.