I hope this helps you
f (1+1)= f (1)+8
f (2)= 27+8
f (2)=35
f (2+1)= f (2)+8
f (3)= 35+8
f (3)=43
And if you need an example this is the website I went to: http://www.mathsisfun.com/data/standard-deviation.html
I am probably wrong but with the math I do I got 35
First, look if y is greater or less than on the graph. Y is less than the line so the sign will be a less than symbol ≤.
Second, look at the slope. The slope is going up 4 and right 1 so the slope is 4.
Therefore, your answer is C. y ≤ 4x + 2