Rewrite the expression by combining like terms.
3xy + 8x^2+ 4y + 2y - 5x^2

Can some one me with these questions

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

Using elimination, what is -4x+2y=-12 4x+8y=-24