Domain: identify all x-values where the graph has at least one point
Domain: look for the leftmost and rightmost x-values on the graph
Domain: include x-values covered by lines, curves, rays, and isolated points
Domain: exclude x-values where the graph has holes, gaps, or vertical asymptotes
Domain: use open circles as excluded values and closed circles as included values
Domain: write the domain in interval notation or set notation
Range: identify all y-values where the graph has at least one point
Range: look for the lowest and highest y-values on the graph
Range: include y-values covered by all parts of the graph
Range: exclude y-values where the graph has gaps or missing outputs
Range: use open circles as excluded values and closed circles as included values
Range: write the range in interval notation or set notation