Solve using elimination

10x - 5y = -20
-5x + 5y = -15

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year

At 6 1/2 cents per pound of string beans how much does 7 pounds cost

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?