Q:I read your article on diagonal bracing and was hoping you would clarify your instructions so I can explain them to my contractor. I, too, have lath-and-plaster walls with many cracks. My house is ...
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.