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Find the verticle asymptote of the rational function f(x) = 3x-12/4x-2
Vertical Asymptote refers to a vertical line wherein the graph approaches. remember approaches, it will not touch this line
so if  you have f(x) = 3x-12/4x-2
the vertical asymptote is from the denominator. remember, that the denominator
must not be equal to 0.
      4x - 2 = 0
          4x = 2
           x = 2/4 or 1/2
  the graph approaches x = 1/2
 
The vertical line is the asymptote of the graph. notice that the graph approaches the vertical line. it will not touch it