what is a line graph, a bar graph,and a pie graph....be specific?

Answer 1

A line graph shows how data changes over time
A bar graph compares several subjects
A pie chart shows the pieces of one subject

Answer 2

A line graph is a series of line segments which link a sequence of points together.

A bar graph is a series of bars often classified by category, and each bar shows the sampled value for the corresponding category.

A pie graph is a series of shapes that look like slices of a pie, each of them showing the proportional share of a category among the other categories.