A real life problem that can describe y=7x-16

Kayla recently started a Hair Business. To buy the supplies she needs she spent 16 dollars. For every persons hair she cut she made 7 dollars.

Elena was in debt to her mom for 16 dollars. each week she will make 7 dollars in allowance. how many weeks until elena is out of debt? (or anything relating to number of days/weeks to make profit, break even, etc)