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What could explain what happened when the time was equal to 120 minutes

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

Determine if the equation defines y as a function of x: 2xy = 1. yes o no