Answer:
The slope is -2
It means that the battery decreases by 2% each hour since Aiden left his house
Step-by-step explanation:
In the equation y = mx + b, m is the slope.
This equation's slope is -2, since it is the coefficient for t.
In the context of this problem, this means that the battery will decrease by 2% each hour since Aiden has left his house.