M/2 +3+3m/7 what is the answer of combine liked terms

Two lines that do not intersect are skew. always sometimes or never

Me with this one question, and i'll upvote the brainliest answer

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