A submarine is 4,000 feet below sea level, and rising a rate of 100 feet pre minute. Write an equation to represent y, the depth of the submarine after x minutes.
Answer: -4000+100x=y Explanation: the submarine is 4000 feet BELOW sea level which is why in the equation there is a negative sign. Then the submarine rises 100 feet per minute and the x represents minutes and y is the depth of the submarine.
