This question I do not understand .someone please explain to me please I need it ASAP!

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

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

How can writing phrases as algebraic expressions you solve problems?