2y - 4 = 0

x + 2y = 5

Y would b 2 because if u make y 2 then 2 times 2 equals 4 and then 4 minus 4 equals 0 so it would b 2 (2) - 4=0 and then for the x+2y=5 it also is 2 bc just act like there's a 1 in front of the x and 1 plus 2 times 2 equals 5 so x+2 (2) = 5