How do you find the slope and y-intersept?

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

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