On the same graph draw line 2y-x=10 and y=3x​

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

How to do this , and can some one explain

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