Algebra-2

To find the rate of change, use the formula:



where (x₁,y₁) and (x₂,y₂) are two points.

Using points (1,25) and (2,18):

Calculate the change in amount of water:
ΔAmount = 18 − 25 = −7 liters

Calculate the change in time:
ΔTime = 2 − 1 = 1 day

Calculate the rate of change: