Model each pair of algebraic expressions using the key. Which of the following are not equivalent expressions?
x+4+y and x+5+y−1
x plus 4 plus y and x plus 5 plus y minus 1
2(x−1)+y and 2x+y−2
2 left parenthesis x minus 1 right parenthesis plus y and 2 x plus y minus 2
x+4+y and 4x+y
x plus 4 plus y and 4 x plus y
x+3+3y and x+3(1+y)
x plus 3 plus 3 y and x plus 3 left parenthesis 1 plus y right parenthesis