Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to ...

How to Change Grid Line Colors on a Chart With Microsoft Excel. Grid lines add horizontal and/or vertical lines to your graph that aid in measuring graph values.

However, that doesn't mean you have to plot your own lines and grid. Instead of using a graph paper template, use a workaround that involves Word's graph paper backgrounds, which are included in ...