Answer:
4 gallon fuel was used for city driving and 5 gallon fuel used on the highway.
Step-by-step explanation:
Consider the provided information.
Let x is the gallon used in highway and y is the gallon used in city.
The fuel efficiency rating for a certain car is 28 mi/gal on the highway and 20 mi/gal in the city.
Thus, [tex]28x+20y=220[/tex]
They used total 9 gallon.
[tex]x+y=9[/tex]
[tex]x=9-y[/tex]
Substitute the value of x in [tex]28x+20y=220[/tex].
[tex]28(9-y)+20y=220[/tex]
[tex]252-28y+20y=220[/tex]
[tex]8y=32[/tex]
[tex]y=4[/tex]
Substitute the value of y in [tex]x=9-y[/tex].
[tex]x=9-4=5[/tex]
Hence, the value of x is 5 and the value of y is 4.
4 gallon fuel was used for city driving and 5 gallon fuel used on the highway.
