Question 327187
Vertical asymptotes occur when the denominator equals zero.
{{{x-3=0}}}
{{{x=3}}}
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{{{drawing(300,300,-6,8,-7,7,blue(line(3,100,3,-100)),graph(300,300,-6,8,-7,7, x/(x-3)))}}}
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The blue line shows the asymptote.