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After visiting the Titanic, Captain Brain and Mr. Pinky are taking the Alvin submarine back to the surface of the water. They start 1700 feet under water. After ascending for 6 hours, they are 1580 feet below the surface of the water. (Note: under the water is negative)

Write an equation to model this situation (use d for depth in meters and x for hours).

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puzzledpusheen

Answer:

d = -20x + 1700

Step-by-step explanation:

First, you need to identify how many meters the submarine travels in an hour. In order to figure this out, you need to know how far they traveled in 6 hours.

In 6 hours, they traveled 1700-1580 meters or 120 meters.

If you divide both values by 6, you'll get that they traveled 20 meters every hour. Now you can write the equation:

depth = 1700 meters - 20 meters (# of hours)

d = 1700 - 20x

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