1.) Are the terms that follow like terms?
3x and x

yes
no
-
2.) 3x2 and 3x
yes
no
-
3.) 3xy and 3yx
yes
no
-
4.) -m and m
yes
no
-
5.) 3xy2 and 3y2x
yes
no
-
6.) 3m and 3n
yes
no