Number of hours Babysitting: x
Number of horus Lifeguard: y
Susan makes $5 per hour babysitting
Money she makes Babysitting: 5x
Susan makes $7 per hour as a life guard
Money she makes as a life guard: 7y
Total money she mahes: 5x+7y
Her goal is to make at least $140:
5x+7y>=140
Answer: First option
5x+7y>=140