Justin and Kane are members of different video game libraries. Justin pays a $65 membership fee and $8 for each video game he rents.

The following function shows the total amount of money, y, in dollars, that Kane pays for renting x number of video games.
y = 7x + 50.

How many more dollars does Justin pay for a membership fee than Kane?

$15
$42
$58
$65

How am I supposed to know if it never even mentions any details about the library that Kane has a membership to? It only talks about Justin's. What do buying videogames have to do with purchasing a membership?