(9, 11) (-7, 17) (-7,3) Is this relation a function? yes or no

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

What is the slope of the line that contains the points (-2,1) and (0,-3)

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