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.

Learn how to plot coordinates and create straight line graphs to show the relationship between two variables. Also, plot graphs that contain a negative coefficient of x.

In a line graph, you would see a downward slope. In economics, ... A demand curve is a good example of an often-used chart that has a negative or inverse correlation. Investopedia.