how do you identify the domain and range in a graph?

Posted on Jul 10, 2008 under domain news and reports | 10 Comments

10 Responses to “how do you identify the domain and range in a graph?”

  1. Domain: from it's title
    Range: from it's axis labels

  2. The domain goes along the x-axis. Range goes along the y-axis.

    Basically, every x-value that has some graph over or under it is in the domain. And every y-value that has some graph beside it is in the range.

    You actually want to look for the places that are not in the domain or range. Those are the most interesting, and looking there will give you the description of the domain and range most quickly.

  3. Kiwi,

    This is a little hard to explain without visual, so I will see what I can find on Google to help.

    A good example is this:
    State the domain and range of the following relation.
    {(–3, 5), (–2, 5), (–1, 5), (0, 5), (1, 5), (2, 5)}
    List the x-values for the domain and the y-values for the range:
    domain: {–3, –2, –1, 0, 1, 2}
    range: {5}
    Copyright © Elizabeth Stapel 2000-2006 All Rights Reserved

    So when you plot the items on a graph, they would creat a line. If you are presented a graph without plot points, and just a line (curved or straight) you would define the domain and range by the lowest and highest X and Y values presented. Sometimes the domain or range and be infinite if the line continues forever.

  4. The domain is the horizontal area covered by the slope. The range is the vertical area covered by the slope. Domain can be substituted by "x" and range by "y". If the graph is a straight line, then the domain and range are all real numbers.If the graph was of a parabola with a vertex at the origin, then the domain is still all real numbers but the range now becomes > or = to 0.

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