If at a depth of 10 feet there is a pressure of 21 lb/in 2 , and at a depth of 50 ft there is a pressure of 75 lb/in 2 , write a linear equation giving a relationship between depth and pressure. Assum...If at a depth of 10 feet there is a pressure of 21 lb/in 2 , and at a depth of 50 ft there is a pressure of 75 lb/in 2 , write a linear equation giving a relationship between depth and pressure. Assuming a linear relationship, write an equation that will give the price of the house in any year, and use this equation to predict the price of a similar house in the year 2020.