Say someone used a line graph to show info about the number of CDs she owned by different arists.Is a line graph a good choiceto show data.... Why or why not?

A line graph is not a good way to represent the data as the number of CDs is a continuous variable, but the artists are a discrete, categoric variable.

A line graph should be used when both variables are continuous. A bar chart or bar graph should be used when one variable is continuous and one is discrete.