Answer:
[tex]w(t) = 800 + t[/tex]
Step-by-step explanation:
Since the increase is the same each year, we can model this situation by a linear function, in the following format:
[tex]w(t) = w(0) + at[/tex]
In which w(t) is the water level after t years, w(0) is the initial water level and a is the yearly increase.
The initial water level of the lake was 800 meters
This means that [tex]w(0) = 800[/tex]
The water level increases by 1 m each year.
This means that [tex]a = 1[/tex]
So
[tex]w(t) = w(0) + at[/tex]
[tex]w(t) = 800 + t[/tex]