Let x be the number of steak dinners and y be the number of chicken dinners sold at a restaurant. Revenue collected for these dinners is modelled by; R(x, y) = 20x + 14y - xy - 2x² - 20 y ² and costs are; C(x, y) = 9x + 3y + 700 Currently, 20 steak and 12 chicken dinners are being sold. Use marginal functions to approximate how much profit will be earned if one more chicken dinner is sold: dollars. Find the number of dinners sold that will maximize profit. steak dinners x= y = chicken dinners.

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