The graph illustrates a system of linear equations.
The cars are 20 miles from Dallas when they are the same distance from the city
From the question (see attachment for graph), we can see that the lines of both graphs intersect at (2,20)
This means that, the cars meet at 20 miles after 2 hours
Hence, the cars are 20 miles from Dallas when they are the same distance from the city
Read more about system of linear equations at:
https://brainly.com/question/14323743