Question 1106906
Graphs work on a grid system where you have lines going up and down and across. It's called a coordinate system.
To graph a point you need both the x and y coordinates. Why? Imagine a fly landed on your bedroom wall. You try to tell someone where exactly the fly landed, you'd have to tell them where across the wall and how high. 
Here is a typical coordinate system:
*[illustration grid.JPG]