8x-2y=48, replace y with 4, 8x-2(4)=48, multiply, 8x-8=48, add 8 to both sides to remove the -8, 8x=56 and finally divide by 8 to remove 8 from x, x=7.
One field is 25 + 45 + 25 + 45 = 140 feet Second field is 40 + 60 + 40 + 60 = 200 feet. Therefore, all together, the two fields are 340 feet in perimeter together
