30. modeling with mathematics you earn
$10 per hour working as a manager at a grocery store.
you are required to work at the grocery store at least
8 hours per week. you also teach music lessons for
$15 per hour. you need to earn at least $120 per week,
but you do not want to work more than 20 hours
per week.

how do i graph and write a system of linear inequalities that represents the situation?