The reason I think this is because y represents how far she has traveled from the town, 5 represents the starting distance from the town, x represents how long she has been traveling, and 25 represents how many miles she has traveled from her starting distance. So henry's equation should be y= 15x +16. Meaning that henry is ahead but Tasha traveled much faster than he did.
I hope this helped and if it is incorrect I apologize :(
