How would you find the coordinate on a graph?

There are lots of different kinds of graphs. "Coordinate" sounde like a simple X-Y graph. The Coordinates are the points where the x and Y points intersect. If the lower left corner is 0, 0 then 2, 6 would be two columns over and 6 rows up. If 0, 0 is in the center, then when X is to the left of center it's a negative value and likewise for Y when it's below the center.

A X-Y-Z graph would be the same for X and Y. Z would represent height. With a table of X-Y-Z coordinates, you can define a three demensional shape with numbers.