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Again the domain consists of the pre-images and the range the images.
When we are looking for the f(x) we just look at the number it is pointing to in the range (when we have a diagram), and when we are looking for x when f(x)=y we look at the number that has a line pointed to y.

So the f(4)= \frac{1}{2}
f(x)=4 when x is 8
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