Which situation could be modeled as a linear equation?

(1) The value of a car decreases by 10% every year.

(2) The number of fish in a lake doubles every 5 years.

(3) Two liters of water evaporate from a pool every day.

(4) The amount of caffeine in a person's body decreases by 1/

3 every

2 hours.

Step-by-step explanation:

In a linear model, the rate of change of the value of the variables is not exponential. This means that the value of the variables increases or decreases by simple addition or subtraction of a constant number.

Therefore, the situation that could be modeled as a linear equation is

(3) Two liters of water evaporate from a pool every day. The constant number being subtracted is 2 liters of petrol.