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6 April, 18:22

Which equation is an identity?

A. 8x+9=8x-3

B. 7x-2=8x+4-x

C. 11 - (2x+3) = - 2x-8

D. 5x+8-x=6x-2 (x-4)

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  1. 6 April, 21:48
    0
    D

    Step-by-step explanation:

    To be an identity we require both sides of the equation to equate

    A

    8x + 9 ≠ 8x - 3 ← not an identity

    B

    7x - 2 = 8x + 4 - x = 7x + 4 ≠ 7x - 2 ← not an identity

    C

    11 - (2x + 3) = 11 - 2x - 3 = - 2x + 8 ≠ - 2x - 8 ← not an identity

    D

    5x + 8 - x = 6x - 2 (x - 4), that is

    4x + 8 = 6x - 2x + 8 = 4x + 8 ← both sides equate thus an identity
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