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x = 6 looks like a vertical line which is centred on the point (6,0)
no
A vertical line in the xy coordinate plane would represent the line of an equation such as x = 1 or x = -4.
Yes, x = -3 would represent a vertical line at abscissa -3, parallel to the y-axis.
The "vertical line test" will tell you if it is a function or not. The graph is not a function if it is possible to draw a vertical line through two points.