Domain & Range
From a Graph
Example
Find the domain and range of the graph below.
Step 1. Find the domain.
Since all x values appear to be present in the graph, the domain is all real numbers, or 
.
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 
.
.