A school choir needs to make T-shirts for its 75 members and has set aside some money in their budget to pay for them. The members of the choir decided to order from a printing company that charges $3 per shirt, plus a $50 fee for each color to be printed on the shirts. Select all the equations that could represent the relationship between the number of T-shirts ordered, the number of colors on the shirts(x), and the total cost of the order(y).