Answer:
zero
Explanation:
You want the rate of change between the points (3, 1) and (4, 1).
Rate of change
The "rate of change" is also known as the "slope" of the line between the points. That is given by the formula ...
m = (y2 -y1)/(x2 -x1)
For your points, this is ...
m = (1 -1)/(4 -3) = 0/1 = 0
The rate of change is zero.
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Additional comment
The y-value is constant. That means the equation of the line is y=1, a horizontal line. It does not rise or fall. Its rate of change is zero.