Let's say that you want to paint a room in your house. the room has rectangular walls. each wall is 8 feet high. two of the walls are 15 feet long, and the other two walls are 12 feet long. based on these measurements, what is the total area of the walls of the room in square feet? (hint: calculate the area of each wall, and add the 4 areas together.) 416 432 454 488

Hello!
volume of sphere =4/3.pi.r^3

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.