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Math Help - graph of a rational function

  1. #1
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    graph of a rational function

    I know how to graph a function such as y=\frac{x-1}{x+2} by using differential calculus. I am studying this document: http://www.chabotcollege.edu/counsel...ent/colalg.pdf



    to take a placement test for school here soon. I was surprised when I was asked to graph the function y=\frac{x-1}{x+2} for a college algebra test. I don't understand how you would do it without using calculus. Is there anyway for someone with no knowledge of calculus to graph a function like this without laboriously calculating a bunch of points?
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  2. #2
    Super Member 11rdc11's Avatar
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    You can use algebra to graph it by knowing the vertical and horizontal asymptotes, x and y intercepts and then plotting some points
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