Answer: y=-9
Step-by-step explanation:
If a variable is by itself then the coefficient is always 1. Think of is as an imaginary 1. In this case since there is a negative in front of the variable it is -1. Then, you divide each side by -1. A positive divided by a negative equals a negative. y=-9
Example: -y=10
-y/-1 =y
10/-1= -10
Therefore, y=-10
