How do you graph the line given (2,4), undefined slope?

##x=2##

Undefined slopes occur with vertical lines, which are in the form ##x="number"##.

The line ##x=2## goes through the point ##(2,4)## since coordinate pairs are in the form ##(x,y)##.

The line ##x=2## looks like:

graph{(y-10000000x+20000000)((x-2)^2+(y-4)^2-1/40)=0 [-13.59, 14.89, -5.09, 9.15]}

A point is placed on ##(2,4)##.