Try this for an explanation of graphs and their parts.
This one explains how to read a graph.
This site has more questions to help you find out what you need to learn about graphs. If you get an answer wrong, find out why! You will be reading graphs your entire life to make decisions about making, saving, and spending money.
This website has everything you need to build graphs and charts.
Here's one more site with graphing questions.
Other Math Practice
Math Olympics: In this game you move a robot through a mine field to a target location without getting blown up. Remember that the x (horizontal coordinate) moves first and the y (vertical coordinate) moves second. If you need more instructions, click on the [help] button and read their more complete instructions.
Feed Billy Bug his grub by finding the correct coordinates to allow Billy Bug to get his food. Check and see how long it takes you to play 10 games and try to beat that number.