What is the equation for this graphed function?

Question

I can't seem to figure out the equation for this simple function, I know that the equation for a vertical line is x = k but this looks like a kind of step function that is infinity when x = k.

Answer 1

In case of infinity, there would have been an asymptote. Nothing can be ever equal to infinity. It can tend to infinity when the variable tends to some value. Moreover, the exact function for the given graph would be

x = 2, y>0.

Answer 2

Well it doesn't qualify the criteria to be called function. For a relation to be a function any point in the domain must have a unique image. So, it is not a function however it is a relation x=2