SOLUTION: Why is the line x = 4 a vertical line?

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Question 318198: Why is the line x = 4 a vertical line?
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
because x cant be any other number but 4
so (4,0) (4,5) (4,-5) (4,10) (4,-10) all on the same vertical line