The Pérez go to a theatre, they buy 1 ticket for an adult and 4 for the children. And the Sánchez buy 2 tickets for adults and 2 for their children. How much does the ticket for children cost?

Same length is comparing because it’s saying its the same and not different

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.

Yes the slope to this is -5