How do I do this and what is the answer?

What is the slope of a line that is perpendicular to y = 3x + 1

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

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