Alyson earns money babysitting and changing tires. She can work no more than 20 hours per week. She earns $14 per hour babysiting and $18 per hour changing tires. She needs to earn at least $275 per week. Write a system of inequalities that shows the various number of hours John can work at each job. Let b represent the hours she babysits, and let c represent the hours that she changes tires.
