What does bold faced mean when it is in a nonfiction book?

Ou work as a cashier for a grocery store and earn $5 per hour. you also mow lawns and earn $10 per hour. you want to earn at least $50 per week, but would like to work no more than 10 hours per week. which system of inequalities, along with y ? 0 and x ? 0, would you use to solve the real-world problem?

X•(-5)=60 someone plz me cause like yeah

Importance of language sensitivity in journalism