Question

dada a fuçao f(x)=1-5x, detremine x tal que f(x)=6

Answer 1

Perceba que basta substituir:

$f(x) = 1-5x\\ 6 = 1 - 5x\\ 6-1 = -5x\\ -5/5 = x\\\\ ~~~~~~~~~~~~\boxed{\boxed{x=-1}}$