Philip P. answered 12/01/21
Effective and Patient Math Tutor
The rate of change between two points, (x1,y1) and (x2,y2), is equal to the slope of the line connecting the two points. The slope formula is:
slope = (y2-y1) / (x2-x1)
Plug the x and y values from your two points into the formula and compute the answer. It doesn't matter which points you choose for (x1,y1) and (x2,y2); you'll get the same answer.