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14 May, 12:48

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

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Answers (1)
  1. 14 May, 15:43
    0
    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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