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Range of a function without graph

  1. Apr 16, 2012 #1
    1. The problem statement, all variables and given/known data

    Determine the range of each function without graphing it

    (a) -(y-2)=4x-1

    (b) y= 3(0.8)-x - 5






    3. The attempt at a solution

    I know it may be easy and all, but i was at a doctors appointment when we learned how to do this
     
  2. jcsd
  3. Apr 16, 2012 #2
    Off the top of my head - find the inverse and determine its domaine.
     
  4. Apr 16, 2012 #3

    HallsofIvy

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    -y+ 2= 4x- 1
    -y= 4x- 1- 2
    y= 2- 4x- 1

    Now if you know that the range of "ax", for any number a (other that 1 or 0) is (0, infinity), the range of this function should be easy.

    Same thing.

     
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