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- anonymous

12. Which equation is an identity? (1point)
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
13. Which equation has no solution? (1point) A. 7v + 2 = 8v - 3
B. 3x - 5 = 3x + 8 - x
C. 4y + 5 = 4y - 6
D. 7z + 6 = -7z - 5
14. Solve the following equation (1point)
5(z - 4) - z = 4z - 20
A. 4
B. -4
C. Infinitely many solutions
D. No solution
15. Solve the following equation (1point)
4 + 2y = 9 + 2y
A. 4
B. -4
C. Infinitely many solu

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- katieb

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- anonymous

Sorry the reply took so long.
An identity is an equation which is true for every value of the variable is called an identity equation.
To make it shorter, I will do 1 example. B says that 7z + 10 - z = 8z - 2(z-5)
Well 7z - z would be 6z + 10.
the other equation is 8z - 2z-10
simplified it is 6z-10
6z-10 and 6z + 10 are not the same, so it is not b. The answer is C.

- anonymous

Thanks dude

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- anonymous

Skipping down to 14.
5(z - 4) - z = 4z - 20
Simplify
5z - 20 - z = 4z - 20
4z - 20 = 4z - 20
The answer would be infinite. No matter what you put in for z, the answer will always be the same. C.

- anonymous

#15 4 + 2y = 9 + 2y
No solutions.

- anonymous

13 is z.

- anonymous

Sorry, i meant C

- anonymous

So
12= C
13= C
14= C
15= no solutions

- anonymous

not completely 100% on those answers, but its the best I can do. :)

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