Many of the following problems can be modeled with a linear equation. Analyze them and identify what quantities the variables x and y represent. The information provided in the problems is adequate to determine a point and a slope or two points on the line.
On October 12, 2002, Audrey Mestre, a French woman, died attempting to break the world record in free diving. In free diving, a diver, without oxygen, uses a 200-pound weight attached to a cable to pull them into the ocean depths. Ms. Mestre’s goal was a depth of 561 feet, which would have set a new record. As a diver descends, the pressure increases due to the weight of the water above. At 18 feet, the water pressure is approximately 8 pounds per square inch and increases to approximately 40 pounds per square inch at 90 feet. Use a linear function to approximate the water pressure at 561 feet depth.
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