Question 134518
Not sure if this is the right header for this, but please help if you can.

Question: Explain why the line x = 4 is a vertical line.

The line x = 4 tells me that the value for x in the form (x,y) does NOT change.
While the value for y will include DIFFERENT values.

This line is vertical at the point x = 4 and y = 0, which looks like this
(4,0).

If you were to travel UP or DOWN on the line x = 4, the value of x will remain 4 while the y changes in value.

I hope this helps.