Simplify -3p - 2m + 8p - 7m
what are the like terms?
show work here (combine like terms):

After you combine like terms you will get 5p - 9m.

-3p + 8p is the same thing as 8p - 3, so you get 5p.
-2m + (-7m) is -9m

-3p and 8p are like terms.
-2m and -7m are also like terms.

Here, feel free to ask if there are any questions