your math teach assigns 25 practice problems a day for homework the other students in your class complain that its way too much but the teacher clams that yu need this much practice in order to succed in the class you set up an investigation to determine if his claims are true

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.