28. MODELING REAL LIFE You can $10 per hour
working at a grocery store and must work there at
least 8 hours per week. You also teach music lessons
for $15 per hour. Between the two jobs, you need to
earn at least $120 per week and work no more than
20 hours per week. Write and graph a system that
represents the situation. Give one example of the
number of hours you can work at each job.