Students will change the "m" and "b" values to see their affect on the graph. This will help them explore domain and range. From the exploration, they can be directed to other explanations of parts of a function.
Shodor is an interactive website with practice and games to reinforce the topic of study. This link is a function machine. Students can enter x and y values to see the effect on the function; they can also evaluate the domains and ranges to determine the function.