f(x - n) - shift n units to right
f(x + n) - shift n units to left
f(x) + n - shift n units up
f(x) - n - shift n units down
Look at the picture.
Answer: 
1 gallon______8.354 lbs.
11.81 gallons______?
8.354 x 11.81 = 98.66
98.66 / 1 = 98.66 lbs.
A whole turn is 360° so to turn 40° clockwise is equivalent to turn 320° counterclockwise.
It is (5x + 6) (x + 2)
The way of deriving this is through cross multiplication
The graph would show this relationship if:
1) It is a straight line
2) It passes through the origin
3) It has a slope of 3.5