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Linear Equation Word Problems 2





 
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This video is for the redesigned SAT which is for you if you are taking the SAT in March 2016 and beyond.

Linear Models
When a scientist dives in salt water to a depth of 9 feet below the surface, the pressure due to the atmosphere and surrounding water is 18.7 pounds per square inch. As the scientist descends, the pressure increases linearly. At a depth of 14 feet, the pressure is 20.9 pounds per square inch. If the pressure increases at a constant rate as the scientist's depth below the surface increases, which of the following linear models best describes the pressure, p, in pounds per square inch at a depth of d feet below the surface?
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