Posted by Wendy on Wednesday, April 16, 2008 at 12:29am.
I assume you mean:
y = 23 x / (x+18)
indeed the denominator goes to zero at x = 18 so you get undefined vertical asymptote at x = -18
as x gets very large positive, this looks like 23 x/x ---> 23
as x gets very large negative it looks like
23 (-x/-x) ---> 23
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