Given the coordinates for the function below, which of the following are coordinates for its inverse?
Gallons Cost, in
of Gas Dollars
1
2
5
15
20
1.25
2.50
6.25
18.75
25.00

g(x) = 0.8x  gal/dollar

Step-by-step explanation:

This is a direct relation, each gallon costs 1.25, 20 gal. costs 25.00, etc.

so

f(x) = 1.25x  where x = number of gal.  f(x) is the cost

The inverse relation is the reciprocal,

for each $1.00, we can buy 1/1.25 = 0.8 gal.

or

g(x) = 0.8x  where x = amount, g(x) is number of gallons

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