Systems of equations company a sends 20 promotional emails per year to customers, and company b sends 15 promotional emails per year. the total number of photos in all the emails of company a for one year is 12 more than the total number of photos in all the emails of company b for one year. each email of company a has 8 fewer photos than each email for company b. write a system of equations that can be used to find a, the number of photos in each email for company a, and b, the number of photos in each email for company b?