\fb) determine the y-intercept PART II: THINKING INQUIRY AND PROBLEM SOLVING 3. The pressure inside a cylinder is inversely proportional to the volume of the gas inside it. When the volume of gas is 50 cm', the pressure is 400 kPa. a) Write a function to represent the pressure as a function of the volume. b) Sketch a graph of this function. c) Calculate the pressure for a volume of 75 cm . d) As the volume increases, what happens to the rate of change of pressure?