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Price Elasticity of Demand explained in this answer
The demand function for Good X is defined as Qx = 75 – 2Px – 1.5Py, where Py is the price of Good Y. Calculate the price elasticity of demand using the point formula for Px = 20 and Py = 10. Determine whether demand is elastic, inelastic, or unit elastic with respect to its own price and whether Good Y is a substitute or a complement with respect to Good X.
Please show all work and explain answer.