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.

In order to work with gradients and straight lines successfully, a good understanding of coordinates and linear graphs is needed. The gradient of a line is calculated by dividing the difference in the ...

Contour planting involves tilling, discing, and otherwise preparing the land in line with its natural slope, then planting crops on this same line. When you look at a topographic map, the rows and/or ...