Write a system of equations to describe the situation below, solve using substitution, and fill in the blanks. Estelle and Diane have summer jobs selling newspaper subscriptions door-to-door, but their compensation plans are different. Estelle earns a base wage of $15 per hour, as well as $2 for every subscription that she sells. Diane gets $3 per subscription sold, in addition to a base wage of $9 per hour. If they each sell a certain number of subscriptions in an hour, they will end up earning the same amount. How much would each one earn? How many subscriptions would that be?

Estelle and Diane will each earn $
if they sell
subscriptions in an hour.