What property is represented by '7y + y = 7y + 1y'

[schleppy]

I am trying to help my son with his homework and don't know much about this subject. He is supposed to tell what property this represents and why.

Thanks in advance for your help.

 

[Loren]

http://www.math.com/school/subject2/les ... 2L1GL.html

 

[schleppy]

Thanks for the link!!!