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

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)

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