The function is X=4?
If the graph is x=4 then the graph is just a verticle like straight up at x=4 axis Meaning at every single y value the x value is 4 you can pick anything
x y
4 0
4 1
4 2
4 3
.
.
.
4 1000000 so so fourth you can pick any y values you want x will always be 4