can you help me with finding x?

A manufacturer is planning to sell a new product at the price of 350 dollars per unit and estimates that if a thousand dollars is spent on development and y thousand dollars is spent on promotion, consumers will buy approximately - 290y _ 180x y+6 2+6 units of the product. If manufacturing costs for the product are 130 dollars per unit, how much should the manufacturer spend on development and how much on promotion to generate the largest possible profit? Remember: Profit = All Revenues - All Expenses/Costs Round your answer to the nearest dollar Development costs: $ Submit Answer Incorrect. Tries 6/99 Previous Tries Promotion costs: $ 13565 You are correct. Your receipt no. is 156-1055 (?) Previous Tries