Susan makes $5 per hour babysitting and $7 per hour as a lifeguard. Her goal is to make at least $140. Let x = the number of hours that Susan babysits. Let y = the number of hours that Susan works as a lifeguard. Which of the following represents three possible solutions to the problem?
One possible solution is $\boxed{(x,y) = (0, 20)}$ (Susan doesn't babysit at all and works 20 hours as a lifeguard. Another possible solution is $\boxed{(x,y) = (20, 0)}$ (Susan doesn't work as a lifeguard at all and babysits for 20 hours). Finally, a third possible solution is $\boxed{(x,y) = (5, 17)}$ (Susan babysits for 5 hours and works 17 hours as a lifeguard).
