Question 1026947: How could someone write a capital i (I) in graphs?
I know that the horizontal lines could be f(x)=5, 1[less than]x[less than]3 and f(x)=1, 1[less than]x[less than]3 but I don't know how to graph the vertical line between (2,1) and (2,5) as a function of x.
Answer by robertb(5830)   (Show Source):
You can put this solution on YOUR website! You may be looking for a needle that is not in the haystack.
The vertical line between the points (2,1) and (2,5) is a relation that is NOT a function, and so it's pointless to try to write it in the usual "f(x)" format. In fact, the equation defining it is simply x = 2 (which quietly assumes that you can partner it with any real value of y.)
BUT...if you really want to force the argument, you can express the relation as a function of y:
f(y) = 2, where  .
However, it still won't make it a function in the sense of x being the independent variable.
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