To find the rate of change between each set of points we can divide the change in the dependent variable y (in this case — the grade) by the change in the independent variable x (in this case — the study time).
Rate of change=y_2-y_1/x_2-x_1Let's find the rate of change for the first two points.
We have found the rate of change between the first two points.
2points/1h
We are told that the rate of change is constant, so it is 2points1h between any two points. This represents the fact that each hour of studying increases the student's grade by 2 points.
