SOLUTION: How can I explain in 50 words that x=4 is a vertical line?

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Question 312597: How can I explain in 50 words that x=4 is a vertical line?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
For all values of y, x is 4. That makes it parallel to the y-axis, or vertical.