To translate the point from \((4, -1)\) to \((6, -1)\), we notice that only the x-coordinate changes from 4 to 6, while the y-coordinate remains the same.
The change in the x-coordinate is:
\[ 6 - 4 = 2 \]
This indicates that we are moving the point 2 units to the right, which can be represented by the function:
\[ f(x) = x + 2 \]
Thus, the function that shows this translation is:
\[ f(x) = x + 2 \]
So the correct response is:
f(x) = x + 2.