Simplify the expression.(Assume x and y are positive.) 
Definitions:
Elastic
Describes a situation in which the demand or supply for a good or service significantly changes in response to price changes.
Cross-Price Elasticity
A measure of how much the demand for a product changes when the price of another product changes.
Quantity Demanded
The specific amount of a good or service that consumers are willing and able to buy at a particular price.
Percentage Change
A mathematical calculation that shows how much a quantity has increased or decreased as a proportion of its previous value, usually expressed as a percentage.
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