Question

A bottlenose dolphin is 10 feet below sea level. Then it begins to dive at a rate of 9 feet per second. What is the equation of the line that represents its elevation, y, after x seconds?

Answer 1

y = -9x - 10
The dolphin is diving 9 feet per second so the rate of change is -9.
It's also 10 feet below sea level which makes the y-intercept -10
Hope this helped!

Answer 2

The bottlenose dolphin is 10 feet below sea level

-10 ft.

it begins to dive at 9 feet per second

y = (- 9x) - 10


y = (- 9x) - 10 is your equation

hope this helps