tables, diagrams, bar graphs, forms, maps
Graphs are a convenient way to impart information to some people, and graph paper simplifies the process of producing graphs.
Some data.
Bar graphs and line graphs.
The answer depends on what information is graphed. There are distance-time graphs, velocity-time graphs, speed-time graphs, acceleration-time graphs.
no but bar graphs do have to start at zero
No, they don't.
All direct variation graphs are linear and they all go through the origin.
line graphs show a change over time
Begin and origin are some synonyms for the word start.
No.
nope!
Either a straight line through the origin or a hyperbola.
They are straight lines through the origin and their gradient is the constant of proportionality.
yes a graph has to start from a point 0.
Nope.
because they wanted to have some fun