Answer:
z = - 1
Step-by-step explanation:
Given
- 18 = 9z - 9 ( add 9 to both sides )
- 9 = 9z ( divide both sides by 9 )
- 1 = z
Answer: 
Step-by-step explanation:

Answer:
-10/1 is simplified for 30/3
hope this helps
The sign of each Y coordinate changed