I need help with 4ourth grade math lesson 8 homework helper asap math

Someone answer asap for ! 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

Solve the system of equations. x=-2y+1 and x+2y=9. show work

Which of these lines passes through the point (1,-1) and has a slope of -3?