Petes’s Pizza placed two orders with its meat supplier. One order was for 13 pounds of pepperoni and 7 pounds of sausage; the order totaled $225. The other order was for 10 pounds of pepperoni and 5 pounds of sausage; this order totaled $170. What is the cost for one pound of pepperoni and one pound of sausage? a: $13 pepperoni; $8 sausage — b: $10 pepperoni; $11 sausage — c: $9 pepperoni; $12 sausage — d: $15 pepperoni; $6 sausage​