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This algebra lesson explains to find the domain and range of a function by looking at the graph.
Given the graph of a function, determine its domain or range. Domain: all x -values that are to be used independent values. When asked to find the domain of a function, start with the easy stuff: first look for any values that cause you to divide by zero. Determine whether a set of ordered pairs represents a function. If a domain is not stated, damain and range, it is generally assumed to be all real numbers. Find the domain and range of a function. Let's look at an example.