There are many questions I have that are like this

Write two subtraction equations that are equivalent to 5 + 12 = 17.

What is the result of adding the system of equations? 2x+y=4 3x-y=6

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