Answer:
You plug in the values of x's and then minus 1 and you get your y
is it...
y=-4/3x+10
........................
-5.9, -4.6, -1/4, 1/2, 1.75, 2, 18, 21.
It would be rounded to $5.90 per gallon. As if something is 5 or above you round up and if it is 4 or less you round down.
