Answer:

Explanation:
The rate of change of a line (linear function) is its slope.
To find the slope (m) of a line, use the formula:

where
and
are two given points on the line.
So, the slope, or rate of change, for this function is:

using the points (0, 5) and (4, 10).
Finally, simplify the constructed equation.

So, the slope, or rate of change, of this function is 5/4.