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Interval Notation

  1. Sep 25, 2007 #1
    I am working with a linear line with positive slope, the points are given.

    1. In interval notation write for which values f(x) > 36



    2. At f(x)=36 x=21



    3. I think it should look like (-inf,21)
     
  2. jcsd
  3. Sep 25, 2007 #2

    Dick

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    Why not (21,inf)? It has POSITIVE slope.
     
  4. Sep 25, 2007 #3
    I thought it should be -inf because it asks for all values below 21, not above... what do you think?
     
  5. Sep 25, 2007 #4

    Dick

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    Looks to me like it's asking for where f(x)>36. Draw a line with positive slope and having f(21)=36.
     
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