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SmarticalParticals
X = 2 means for whatever y value you select the x value will be 2. So if you graph a couple of coordinates it becomes quickly evident that x = 2 is a vertical line that crosses the x axis at 2.
Susuu
x = 2

This would show a vertical line crossing the x axis at 2. 

Since y = 0, there is no y intercept, which means it does not cross the y axis.