How do you dind the domain and range on a graph?

You look at the numbers for b.

Domain is all the possible X values while Range is all the possible Y values and you express this as an ordered pair. So, say you have a straight line, your domain will be (-∞, ∞) and your range will also be (-∞, ∞) the only time you will use numbers is if you have asymptotes, or you have the min or max of a parabola, which then you would use brackets around that number since that number is included in the graph