A linear relationship (or linear association) is a statistical term used to describe the directly proportional relationship between a variable and a constant.

The SLOPE function does a linear regression on the data you put in and returns the slope. Simple. Also, there is the INTERCEPT function: ...

The plot function creates a 2D plot with the slope-intercept form of the equation, and the (x,-10,10) part specifies the range of the graph, between the x values of -10 and 10.

Learn and revise how to plot coordinates and create straight line graphs to show the relationship between two variables with GCSE Bitesize Edexcel Maths.

Velocity-Time graphs Similarly, if you are finding the gradient to the curve of a velocity-time graph, then you are calculating the acceleration of the object at that particular time.