-6z + 0= -6z is what property

please

That is the identity property. The identity property states that any number, n, added to 0 will equal that same number (n).

Ex: n + 0 = n

The identity property also states that any number, again we'll choose n, multiplied by 1 is equal to that sane number.

Ex: n x 1 = n

For some more properties, refer to this website:

http://www.math.com/school/subject2/less…

Hope I helped...

identity property