1.yes, when you are subtracting 3x from 4x you get 1x or x. then x+22. yes subtract 2y from 3y then add 1 and 3 finally add y and +43. only expression A & C, because 9x-3x equals 6x then minus 4 equals 6x-45x+x equals 6x then minus 4 equals 6x-4 and 12x-4 does not equal 6x-4