Linear Equations:
y = mx + b
The y will of course, be the y coordinate
The m, would be the slope
X, the x coordinate
B, the y intercept
I'm not really sure what your question is, but to graph these, first put a dot at the y intercept, or if there is none, just 0. Then, take the slope, and place a point accordingly, for example, if the slope was 1, then the line would move up one unit per every x coordinate, if that makes any sense. And then, connect the two, and draw the line.
Did that make any sense?