Consider the relationship given by QCars = 100 + 4xPCars - 2xPSteel - 0.2xPWorkers, where QCars is the quantity of cars (in thousands), PCars is the price of cars and PWorkers is the wage earned by autoworkers. If the price of steel is $10 per unit and the price of workers (the wage) is $20, what is the supply curve for cars?