Book Maths Puzzle Algebra

How do I solve by graphing
y = 2x;
y = -x + 3

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Book Other Question

If an aircraft pilot wishes to fly to a city that is N20'E of the airport. A wind is blowing at 60KM /hour from the northwest. If the airplane has a cruising speed of 520 km/hour? An airline has 2000 passengers each day paying $100 each, and knows that for each $10 increase in price they lose 50 passengers. What would be the equation that would determine their maximum revenue?