Why can you choose to add or subtract when subtracting a expression

Write the pair of fractions as a pair of fractions with a common denominator

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

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid