Solve this system by substitution. y = 4x - 9 y = 6x - 15 +Remember to write your answer as a coordinate point (x, y).​

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?