Answer:
[tex]D=21x[/tex]
Step-by-step explanation:
Zach’s car travels 21 miles on 1 gallon of gas. .
The equation that represent the relationship between the gas Zach's car uses and the distance he travels can be given as:
[tex]D=21x[/tex]
Where x is the number of gallons used and D is the total distance covered in x gallons.
