An engineer determined that the weight of a car and gas mileage have a linear relationship. A car that weighs 3500 pounds has a gas mileage of 20 miles per gallon. Another car that weighs 2500 pounds has a gas mileage of 29 miles per gallon. Let x be the weight of the car and y be the gas mileage of the car in miles per gallon. Use the point-slope formula to write a linear equation.

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