Please someone help with these!

Someone answer asap for ! the boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a. e = 2b - 212 b. b = 2e - 212 c. e = -2b + 212 d. b = -2e + 212

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

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is