From a Graph
Example

Find the domain and range of the graph below.

DRGraphEx1-1

Step 1. Find the domain.

Since all x values appear to be present in the graph, the domain is all real numbers, or DRGraphEx1-2.

Step 2. Find the range.

Since the horizontal asymptote is y = -2, then there will not be any values below, or at, y = -2. The range is y > -2, or DRGraphEx1-3.

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