a) 0+7=7

b) 1∙9=9

c) x+3=3+x

d) x+1=x

21. which equation has no solution?

a. 7y + 9 = −7y − 9

b. 5x + 2 = 5x − 3

c. 4v − 3 = 4v + 6 − v

d. 2z + 1 = 3z − z + 1

22. solve the following equation

3x + 4 = 5x − 10

23. solve the following equation

2(2x + 1) = 4x − 5

24. solve the following equation

−2x − 2 = 2(3x − 1) − 4(−6 + 5x)

D

Step-by-step explanation:

If you add 0 to anything, you do not have anything new when you are finished. A is an identity.

When you multiply 1 times anything, you do not get anything new. B is an identity

When you switch the order of two numbers and they are not affected by signs, then you are using the commutative property of addition. Nothing changes. C is an identity.

D is the problem child. Nothing I can think of right now will not change will you add 1 to it. If you can think of something that doesn't change when you add one to it, please put it in the comments. Otherwise, D is not an identity.

The first answer to your first question is option D, write down your equations in a notebook and start writing stuff down so you can learn well. Your doing great

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