Hi there! That is quite the question!
Under Grade 10 Math, on the VLC there are some great sites to help you figure out Algebra questions.
http://vlc.ucdsb.ca/10math
I noticed you are in Grade 8. You might want to try some of the algebra links under Grade 8 Math... to build up to Grade 10!
http://vlc.ucdsb.ca/c.php?g=170735&p=1124827
Good Luck!
Mrs M.