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21 September, 20:54

12. Which equation is an identity?

A. 11 - (2v + 3) = - 2v - 8

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

C. 7m - 2 = 8m + 4 - m

D. 8y + 9 = 8y - 3

13. Which equation has no solution?

A. 5v + 3 = 5v - 5

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

C. 2y + 5 - y = 2y - 3 (y - 6)

D. 7z + 9 = - 7z - 6

+2
Answers (2)
  1. 21 September, 23:30
    0
    12) the answer is A

    11 - 2v-3=-2-8

    8=8

    13) the answer is A

    because 3 are not equal to - 5

    or

    5v+3=5v-5

    5v-5v=-5-3

    0=-8 (false)
  2. 21 September, 23:31
    0
    12. Answer is B

    13. Answer is A

    step-by-step explanation:

    12. A. 11 - (2v + 3) = - 2v - 8

    11-2v + 3 = - 2v-8

    -2v + 2v = - 11-3-8

    0=-22

    this equation has no identity

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

    5w-6w+2w=x-8+8

    w=x

    this equation has an identity

    C. 7m-2=8m+4-m

    7m=6+7m

    0=6

    this equation has no identity

    D. 8y + 9=8y-3

    8y-8y=-3-9

    0=-12

    this equation has no identity

    13. A. 5v+3 = 5v - 5

    5v-5v=-5-3

    0 = - 8

    this equation has no solution

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

    2x - x=7+4

    x=11

    this equation has a solution

    C. 2y + 5-y=2y-3 (y-6)

    2y+5-y=2y-3y+18

    y+5=-y+18

    2y = 13

    y=13/2

    this equation has a solution

    D. 7z + 9 = - 7z-6

    14z=-6-9

    14z = - 15

    z=-15/14

    this equation has a solution
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