PLEASE SOMEONE HELP ME!!!!! THIS IS MY 3RD TIME ASKING THIS QUESTION!!!!

PLEASE Fill In The Blanks!
substitution is the best method to use when one variable is already ____ or when one variable can be easily ____.

Respuesta :

Ningwa

Answer:

It's a guess.

1 known

2 cancelled.

Hope this helps!

And I am sorry if it doesn't