gy3jg3n775 gy3jg3n775 08-03-2021 Mathematics contestada Joe's Plumbing charges $75 for a service call, plus $30 for each hour of work. Maggie's Plumbing uses the equation y = 40x + 50 to calculate the cost, y, for x hours of work. After how many hours of work will both companies charge the same amount?