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

They slope in opposite directions, one has a positive gradient and the other has a negative gradient. The product of their gradients is -1, which means their gradients multiply to -1.

How to Find the Slope of a Line on an Excel Graph. In math and statistics, you may occasionally need to calculate the slope of a line generated by coordinates in the (x,y) format.

Gradient = change up change right or change in y change in x Using the points (0, 0) and (20, 23), the gradient = 23 20 = 1.15. The units of the axes help give the gradient a meaning.