Solve the system of linear equations by the elimination method. 
If the system is dependent or inconsistent , indicate this.
Definitions:
Competitive Industry
An industry where numerous sellers offer similar products, ensuring no single entity can dictate prices, fostering competition based on price, quality, and innovation.
Monopolist
An individual or entity that is the sole provider of a particular good or service in the market, enabling them to control prices.
Substitutes
Goods or services that can be used in place of each other, where the increase in price of one leads to an increase in demand for the other.
Imperfectly Competitive
Describes markets where individual sellers have some control over the price of their goods or services, as opposed to perfect competition where none exists.
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