What option should I choose?

Which ahows the graph of the solution set of 6x+4y< 12

Ataxi company charges $2.25 for the first mile and then $0.20 per mile for each additional mile, or f = $2.25 + $0.20(m - 1) where f is the fare and m is the number of miles. if juan's taxi fare was $6.05, how many miles did he travel in the taxi? if juan's taxi fare was 7.65, how many miles did he travel in taxi

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76