I swear y'all are so fkn smart u need to help me abaha I'll brainlist u.​

Which is a graph of a proportional relationship?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Josh has a rewards card for a movie theater he receives 15 points for becoming a rewards card holder he earns 3.5 points for each visit to the movie theater he needs at least 55 points to earn a free movie ticket which inequality can josh use to determine x, the minimum number of visits he needs to earn his first free movie ticket.