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

On Friday I posted a piece about a problem with vertical lines appearing on PowerBook G4 17-inch screens just as they got outside of their three-year AppleCare warranty. Anecdotal evidence suggests ...

How to add vertical lines to a Word document using Office 365 Your email has been sent The article How to add horizontal lines to a Word 2016 document shows you two ways to add horizontal lines to a ...

Hello, I'm Mr Firth, and together we're going to learn about lines of symmetry. Symmetry is when one side of a shape looks exactly like the other—just flipped. Lots of buildings use symmetry because ...

Printer cleanliness and ink supply problems can cause fine vertical lines to appear in printed images; however, low resolution prints present additional problems of their own. Low resolution images ...

When Word inserts a vertical red line into your margins when you create a new paragraph, it means someone has enabled change tracking in the document. Change tracking is often used with shared ...