What is the value of the function at x = 3?

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When x=3, then y=4

the value of the function at x=3 is 4

you have to look the value of y-axis, when x=3

-- Go across the x-axis until you reach  x=3.

-- From there, go straight up until you hit the graphed line.

-- See how far up you had to go to reach the graph. 
You can read that number off of the y-axis.
It's the value of the function when x=3 .