SOLUTION: Could you explain why the line x = 4 is a vertical line. I need help. Thanks Yolanda

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Question 144835: Could you explain why the line x = 4 is a vertical line. I need help.
Thanks
Yolanda
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Notice how "y" is not present in the equation. So what x=4 is saying is that x-coordinate must be equal to 4, but y-coordinate can be any number. This means that the equation generates the table
xy
4-5
4-4
4-3
4-2
4-1
40
41
42
43
44




And if we plot these points, we get




So this results in a vertical line through x=4.


Graph of x=4