Answer:
Let y be the missing value.
(x - 9) + y = 0 ----> this is our equation now.
Solution:
(x - 9) + y = 0
y = - x + 9
Checking:
substitute the value of y to the equation.
(x - 9) + (-x + 9) = 0
x - 9 - x + 9 = 0
0 = 0
The answer is -x + 9.
Step-by-step explanation:
