These points show that this is not going to be a linear line. This is actually a parabola.
I find that the function rule is going to be

<em>Hope this helps!!!</em>
The formula is y=0.5m+20
You start (0,20) then for each mile you increase by 0.5.
Or
Since the x axis is by two, then every two miles you increase by 1 mile. So (0,20); (2,21); (4,22); (6,23); (8,24).
Ron must work 9 hours. If he makes 300 every 5 hours, that means he makes 60 every hour. 60x9 = 540
your question is incomplete dear check it once
Could we have a photo of the question please