Answer: 28
Step-by-step explanation:
28 is thhe missing number
X => -8 -6 -8 3
y => 33 31 39 33
is not a function because the x value -8 results to two different y-values 33 and 39.
You line up the numbers shown in the photo, then add each column
Increase : 29.96
Decrease: 26.04