The demand function for an office supply company's line of pencils is p = 23 - 2q, where p is the price per box of pencils when q boxes are demanded (per week) by consumers. Find the level of production that will maximize the manufacturer's total revenue and determine this revenue (assuming all boxes produced are sold). (4 marks) Solve the system of equations: (4 marks) x2 - y = 11 x - 4y = 11