Question 1202295
the formula in a direct variation type problem would be y = k * x
when y = 240 pounds per square inch of pressure and x = 80 feet below the surface, solve for k to get k = 240 / 80 = 3.
that's the constant of variation.
when the depth is 30 feet, the formula becomse y = 3 * 30 = 90 pounds per square inch of pressure.
that's your solution.