The demand function for Good X is defined as Qx = 75 - 2Px - 1.5Py where the Py is the price of Good Y. Determine the price elasticity of demand using the point formula for Px = 20 and Py = 10. Estimate whether demand is inelastic, elastic, or unit elastic with respect to its own price and whether Good Y is a substitute or a complement with respect to Good X.