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How would I graph this in my TI-83?

  1. Aug 17, 2011 #1
    1. The problem statement, all variables and given/known data

    |y| = 7-x

    The closest I can do is y=abs(7-x), but this just gives me a straight line along the y axis. Thank you for your time.


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Aug 18, 2011 #2

    SammyS

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    In this case x is a function of y, rather than y being a function of x.

    You can either:
    (1). Graph x on the vertical axis & y on the horizontal axis by switching x & y in your equation, then solve for y.

    (2). Do a parametric plot: Let yt = t and xt = 7 - abs(t), because x = 7 - |y|. Have t go from -20 to 20.​
     
  4. Aug 18, 2011 #3

    PeterO

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    You could graph two lines: y = 7 - x and -y = 7 - x [better known as y = x - 7]

    This would give to two intersecting lines making a large X

    You only want two if the branches.

    You want either the V, the inverted V [can't type it upside down] or the left hand two [>] or the right hand two [<].

    You could test the original expression by chosing a known point on each of the sections, to check which two you want, if you can't think of any other way of doing it.
     
  5. Aug 18, 2011 #4
    Ah. THank you guys. I wish I thought of those methods.
     
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