In math and statistics, you may occasionally need to calculate the slope of a line generated by coordinates in the (x,y) format. The slope is a value that indicates the rate at which the y value of a ...

We all know that Excel can make some gorgeous charts and graphs, but if you are like 30 Rock's Liz Lemon and don't know your scatter plot from your triangle graph ("I don't know. It sounded real!"), ...

When a relationship between two variables is defined by a curve it means that the gradient, or rate of change is always varying. An average speed for a journey can be found from a distance-time graph ...