Hello there! I’d be happy to assist you with this question.
So we need to isolate M by itself to find out what it equals, you do that by the following:
You must add 4 to both sides in order to cancel out the -4 and isolate M.
9 = m - 4
+4 +4
Now - 4 + 4 = 0
9 + 4 = 13
So 13 = m
I hope this helped, and thank you for contributing to Brainly!
Regards,
-Luke
