Which equation is an identity? a. 8-(5x 2)=-5x-6 b. 7z 10-z=8z-2(z-5) c. 8m-4=5m 8-m d. 6y 5=6y-5

asked Sep 2, 2017 16.3k views

3 votes

Which equation is an identity?

a. 8-(5x 2)=-5x-6

b. 7z 10-z=8z-2(z-5)

c. 8m-4=5m 8-m

d. 6y 5=6y-5

by Mutiu

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5 votes

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)

Tunguski answered Sep 5, 2017

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