After 3 minutes, a submarine had descended to −320 feet. After 8 minutes, the submarine had descended to −420 feet. Assuming a linear function, write an equation in the form d(t)=mt+b that shows the depth, d(t), after t minutes

Step-by-step explanation:

The depth function is:

After 3 minutes, a submarine had descended to −320 feet.

This means that . So

After 8 minutes, the submarine had descended to −420 feet.

This means that . So

From the first equation:

So

And

So

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