What is the solution to 7x-2y=-6 8x+y=3

Carter drank 15.75 gallons of water in 4 weeks. he drank the same amount of water each day.a. estimate how many gallons he drank in one day.b. estimate how many gallons he drank in one week.c. about how many days altogether will it take him to drink 20 gallons?

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

3x + 4y = 5 x- 3y = -7 solve by substitution