Question

Solve.

15 – z = 6

A.
–9

B.
21

C.
–21

D.
9

Answer 1

Have you considered adding z and subtracting 6?

Answer 2

is it 21

Answer 3

Demonstrate your work and let's see where you wandered off.

Show what you get after adding z to both sides.

Answer 4

i said 15+6

Answer 5

No, that's the magic method where you forget all the rules. Just add z to both sides and show your result.

Answer 6

idk

Answer 7

15 - z + z = 15 + 0 = 15

You do the right side.

Answer 8

9

Answer 9

{sigh} - Part of what you should be learning is thinking and styling. Trowing down possible answers is not very helpful. You have to develop a style that is consistent and that actually makes your life easier - rather than a style that leaves you guessing half the time.

15 – z = 6

Add z

15 – z + z = 6 + z

Simplify

15 = 6 + z

Subtract 6

15 - 6 = 6 + z - 6

Simplify and rearrange

9 = 6 - 6 + z

Simplify

9 = z

Straight forward. Easily followed. No question what happened or why.