Identify all possible y-values on the graph
Find the lowest y-value and the highest y-value
Check whether the graph includes or excludes those endpoint values
Write the range using interval notation or inequality notation
Include any gaps, breaks, or separate parts of the graph
For graphs with arrows, extend the range in the direction of the arrows
For graphs with holes, exclude the y-values at those holes
For graphs with asymptotes, exclude any y-values the graph never reaches
List all y-values covered by the graph from bottom to top