suzybarienca suzybarienca

23-09-2016
Mathematics

Answered

which equation is an identity?

A8-(5x 2)=-5x-6

B7z 10-z=8z-2(z-5)

C8m-4=5m 8-m

D6y 5=6y-5

Verified Answer :

nobillionaireNobley nobillionaireNobley

25-09-2016

7z + 10 - z = 8z - 2(z - 5)
7z + 10 - z = 8z - 2z + 10
6z + 10 = 6z + 10
6z - 6z = 10 - 10
0 = 0

Therefore, 7z + 10 - z = 8z - 2(z - 5)

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